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### 1. 36 men can do a piece of work in 25 days. In how many days can 30 men do it?

Here , the work is same.. So,

(S X T) / W = (s X t) / w

= > (S X T) / ~~W~~ = (s X t) / ~~w~~ [ Cancel W for both sides]

= > 36 X 25 = 30 X t

= > (36 X 25) / 30 = t => t = 900/3 =

__30__

### 2. 32 men can do a piece of work in 15 days working for 6 hours a day. In how many days will 40 men can finish it if they work for 8 hours a day?

32 X 15 X 6 = 40 X d X 8 = 9

### 3. If 16 men can build a wall of 52 m long in 25 days working for 8 hours a day, in how many days can 64 men build a similar wall of 260m long working for 10hrs a day?

(16 * 200) / 52 = (64 * X * 10) / 260

=> X = 25

=> X = 25

### 4. A man engaged 10 laborers to make 320 toys in 5 days. After 3 days he found that only 120 toys were made. How many additional men should he engage to finish the work in time?

here, equate the complete work with the remaining work

(10 X 3) / 120 = (10+X) x 2 / 200

= > 10+X = 25 => X = 15

### 5. A can do a task in 20 days and B can do it in 30 days. In how many days can they finish it if they work together?

A's one day's work = 1/20

B's one day's work = 1/30

=> Their one day's work = (1/20)+(1/30) = (3+2)/60 = 5/60 = 1/12

This is their one day's work TOGETHER.

So, obviously the number of days will be = 12

**Short Cut :**calculate Product/Sum = (20 X 30) / 50 = 12 Thats it

### 6. A, B and C can do a job in 20 days, 30 days and 60 days respectively. If they work together, in how many days will the work be finished?

(1/20)+(1/30)+(1/60) = (3+2+1)/60 = 6/60 = 1/10

So, the number of days is = 10

### 7. Two taps A and B can fill a tank in 10 hours and 15 hours respectively. a third tap C can empty the full tank in 12 hours. How many hours will be required if all of them are opened simultaneously to fill in an empty tank completely?

Here, first two are Inlets and the last one is Outlet,

So, (1/10)+(1/15)-(1/12) = (6+4-5)/60 = 5/60 = 1/12

So, our answer is 12

### 8. A and B can do a job in 12 days. B and C in 15 days and C and A in 20 days. In how many days can they finish it if they work TOGETHER?

A+B = 12

B+C = 15

C+A = 20

So here, A+B's One day's work = > 1/ (A+B) = 1/12

B+C's one day's work => 1/ (B+C) = 1/15

C+A's one day's work = > 1/(C+A) = 1/20

Just Add them => 1/( 2A+2B+2C) = 12/60 = 1/5

=> 1/2(A+B+C) = 1/5

=>1/(A+B+C) = 1/10 [this is their one day's work TOGETHER]

So, they can finish it in 10 days :)

### 9. A and B can do a job in 12 days. B and C can do the same job in 15 days. C and A in 20 days. In how many days can A alone finish the whole task???

A+B = 1/12

B+C = 1/15

C+A = 1/20

Here we need A, so take a pair which is NOT HAVING A and subtract it from the others,

so, A+B-(B+C)+C+A = A+B-B-C+C+A = 2A

But according to our Problem, 2A = (1/12)-(1/15)+(1/20)

=>A = 1/30 (this is A's one day work but we need A's total work)

=> A = 30 Days

But according to our Problem, 2A = (1/12)-(1/15)+(1/20)

=>A = 1/30 (this is A's one day work but we need A's total work)

=> A = 30 Days

### 10. A and B can do a piece of work in 20 days. A alone can do it in 30 days. In how many days can B alone do it?

Per day work of A and B = 1/20

Work done by A= 1/30

So, B's one day work = 1/20 - 1/30 = (3-2)/60 = 1/60

=> B's work is 60 Days

**Short Cut :**Product/diff = 600/10 = 60 :)

That's all for now friends. All the best and Happy Reading :)

Admin,3rd quetion explanation is confusing,pls elaborate explanation

ReplyDeleteYou might have confused with the number 200. Its the multiplication of 25 and 8.

DeleteAnd about the denominators in the first case our target is 52 m wall, in the second case 260 m wall. We equate both of them coz we know that the value of (Strength X Time ) / Work = 1

(if you know that X=1 and Y=1 then you can say X=Y no? same case here)

If still you are confusing plz let us know. We will update with another method. Good Day.

excellent mam

DeleteReally good one mam...

Deleteits reallly awesome

Deletethank u mam. . it was really useful . . .

DeleteMam in question number 9 plz explain 2A=(1/12)-(1/15)+(1/20) how this becomes 1/30... because when i calculate it as (1/12)-(1/15)+(1/20) = (5-4+3)/60 = 8/60... then how it becomes 1/30

DeleteMam plz explain in question 9 How 2A=(1/12)-(1/15)+(1/20) becomes 1/30..

Deletebcz (1/12)-(1/15)+(1/20)=(5-4+3)/60=4/60=2/30

5-4-3/60=2/60=1/30

Delete5-4+3/60 =1/15=2A => A =1/30

Deletethanks..guide 4 bank exams

ReplyDeletewats there to be confusing its crystal clear, just multiply 25*8=200

ReplyDelete(16*25*8)/52=(64*X*10)/260

X=25

describe 4th problem how can u calculate that

ReplyDelete10 laborers workd for 3 days and made 120 toys...

Delete10 laborers and some additional men SHOULD made the remaining 200 toys (320-120) in 2 days. So just equate those two equations. Read basics so that you can easily understand the process.

mam i hav no words for ur work..u r just awesome....i really felt difficult to solve these types of problems but now i can easily solve it..thnks alot....

ReplyDeleteRishabh Kapoor

Really doing a great job. may god bless you ... plz describe the 9th problem. how that 2A and Divided by 4 appears here

ReplyDeleteSorry for the late reply friend, here is your explnation..

DeleteFirst have a close look at 8th problem, so that you can easily understand the 9th one.

In the question, they've asked that "A's individual Work".. We dont know that. But we do know A+B's work, B+C's work and C+D's work.

so here our target to eliminate B and C... so we took that pair and subtracted from the remaining pairs...

Result =>

A+B-B-C+A+C

B and C got cancelled and two As are there => 2A

now equate this to A's total work per day (Simplified in the problem above with detailed steps. please have a look. And let us know if you still feel its difficult.

Good Day

Thank you :)

DeleteThank you....

Deletereally superb mam

ReplyDeletevery easy to understand.Thank you mam

ReplyDeletethanks4 bank guide. its excellent!thnak u mam

ReplyDeletereally a great job mam,thank u mam

ReplyDeleteshivani, you are really doing a gd job.....thank u 4 dat...really very helpful

ReplyDeletegrt job mam...... plz rectify d mistake in no. 6 as it will b confusing 4 other...... :((((((((

ReplyDeleteSorry Priyanka. Its a typing mistake... Corrected it now... Thank you so much for the update

Deletetill now i felt TIME n WORK problems are difficult to solve..after learning this formula..it became easy..thank u mam:)

ReplyDeleteSir, how to solve the problems of working on alternate days?

ReplyDeleteThere is a shortcut method for those sort of problems Friend. Cant explain that here in comments section. We will try to update that method by next week.

DeleteYour work is quite appreciable as u n ur team is giving good, must say best material for concerning and go through. Keep going mam. Wish u n ur team a huge success.

ReplyDeleteUr team is working precisely.

ReplyDeletehow excellent work u have done...thaxs mam for ur support its really nice ..

ReplyDeletekiran

your work beyond expectation...thanks a ton..

ReplyDeleteis solve of problem 2 right??plz explain

ReplyDeletesorry its right.i have used wrong number

ReplyDeleteVery usefull for bank exames....thanku mam

ReplyDeleteits very useful and easily understood by everyone mam.....thank you...

ReplyDeleteVery very useful,thank u very much

ReplyDeletetricks are very useful........ thank u very much

ReplyDeleteGrt job upload more. G. . .

ReplyDeleteHelped me a lot...Thanks...

ReplyDeleteI can't understand example 4 can u plz explain me

ReplyDeletethis is very helpful...Alternate days...and remaining part also pls..upload...

ReplyDeletegr8 job admin whenever i got a job i must donate or help for your best service..but numb 4 is little bit confusing

ReplyDeleteplz provide the solution for the following....

ReplyDeleteA can do 3/4 of a work in 30 days.B can do 2/3 of a work in 20 days.In how many days can both of them complete it if they work together...?

Plz provide the solution for the following...

ReplyDeleteA can do 3/4 of a work in 30 days .B can do 2/3 of a work in 20 days .In how many days can both of them complete the work together?

To the question above A and B together can complete the work in (120/7) days or 17(1/7) days.

ReplyDeleteSolution: A requires 40 days to complete the task and B takes 30 days. So together they take 40*30/40+30 days.

Sir, can you explain the logic to solve the following problem

ReplyDeleteIf 12 men and 16 boys can do a work in 5 days, 13 men and 24 boys do it in 4 days. In how many days can 7 men and 10 boys do it?

NICE NEED MORE EXPLANATION FOR Q.NO 4

ReplyDeleteNEED MORE EXPLANATION FOR 4

ReplyDeleteGOOD WORK

ReplyDeletepls sir giv explanation for qs no.6

ReplyDeleteVery nice...till now i felt these problem very tough to solve but after reading this nw m so happy dat m able to solve such kind of problems...

ReplyDeleteThank u so much

its really good........

ReplyDeleteActually, that Product/Sum formula is applicable only for problems having 2 persons ah !? you have applied that in 5th and 10th question ! Won't it be applicable for 6th sum having 3 persons ?!

ReplyDeleteThere is another formula for 3 person

DeleteXYZ / (XY+YZ+ZX)

RESPECTED AUTHOR, PLZ INCLUDE SOME MORE PROBLEMS ON TIME AND WORK,

ReplyDeleteProb No 8.

ReplyDeleteA+B's one day work =1/12

B+C= 1/15

C+A= 1/20

Just add,

2(A+B+C) 's one day work =1/5

(A+B+C)'s one day work is = 1/10

So 10 Days.

A can do a piece of work 25 days and B in 20 days. After they worked together for 5 days, A goes away. The number of days required for B to complete the remaining work?

ReplyDeleteA can do a piece of work 25 days and B in 20 days. After they worked together for 5 days, A goes away. The number of days required for B to complete the remaining work?

ReplyDeletecan u pliz upload solution on problems relating to question, working on alternate days and on some tough questions. 10 q sir

ReplyDeletereally useful thank u

ReplyDeletereally useful thank u

ReplyDeleteThese contents are very useful.

ReplyDeleteThank u very much madam.

U r awesome.

Please upload other topics as early as possible.

plz can u give few more explms.....

ReplyDeletecan u please gve few more exmples....

ReplyDeleteHi mam,

ReplyDeletein 3rd example, u forget to write/multiply 8.

I should be 16*25*8 / 52 = 64*10*X/260

X=25

You have written the right answer

Hi,

ReplyDeleteIn 1st example, no. of hours workedis not given So what do we consider the value for no. of hours?

.

As in 2nd example, no. of hours is given So u have multiply s*t*no. of hours worked.

too good, excellent....

ReplyDeleteCan u get the ans of 6th problem using the procedure of 5th problem i.e, (product/sum). If not what is the difference?

ReplyDeleteThank u so much mam ..Great work..please add some different questions regarding pipes

ReplyDeletesuper work madam....just one request please provide pdf files for all topics it is easy to take printouts

ReplyDeletethank u sooooooo much madam... but one request madam please provide pdf for all topics it is easy to take printouts

ReplyDeleteHello mam....I hv a problem...

ReplyDeleteQ- ajit can do as much work in2days as baljit can do in3days and baljit can do as much in 4 days as diljit in 5 days. A piece of work takes 20 days if all work together. How long would baljit take to do all the work by himself??

Hello mam, I hav a ques.

ReplyDeleteQ- ram can do as much work in 2days as baljit can do in 3days nd baljit can do as much in 4 days as diljit in 5days. A peice of work takes a 20 days if all work together. How long would baljit take to do all the work by himself??

thankuuu so much :)

ReplyDeletevery useful info... thnx

ReplyDeletethank u for ur great work... after reading this method am able to solve this kind of problem...and one more help mam ...please solve the problem which is given below::45 man can complete a work in 16 days, 6 days after they started working, 30 more men joined them. how many days will they now take to complete the remaining work??? any shortcut for this problem,,,??pls help me i cant undestand this type of problem

ReplyDeletei can't write any comment with my name..

ReplyDeleteExcellent work....super.....

ReplyDeletea & b working togethr for 2hr & 3hrs and they complete half the work.. in work of next 3hrs they had to complete 1/20th work.. if b alone do work.. wen it ll complete

ReplyDeleteplz try to post more difficult questions for practising

ReplyDeleteThanks :)

ReplyDelete