Aptitude - Time and Work - Discussion

Bhanu you are genius.

Fantastic approach.

Here is my approach.


Add the men and boys in each seniario which will be like the following,

6+8= 10 so (14 persons can do the work in 10 days) -- 1
26+48=74 so, (76 persons can do the work in 2 days) --2

now the question is, 20+15 i.e (35 person can do the work in how many days?)

take the second senario,

if 74 person can do the work in 2 days, 35 person do it in approx 4 (less than) days.

There is no Answer given less than 4, s0 we can take 4 as answer. simple. (CAT needs smart work than hard work)

Thanks sudha good explanation.

Hi. Siddhu really very nice explanation. Thank you so much.

It can be solved more easily in this way
see in 1st ... 6 man are changing to 15 men in question ...n
8 boys r changing to 20 boys in q........so

Here we can see a change of "2.5" .. .( 6*2.5= 18 n 8*2.5=20)
as inverse relation with men n time........10 days will divded by 2.5
ans is 4days

Thanks bhanu chander.

Is there any shot cut formulas to solve x and y values ?

Then apply x value into 1st equation
6x+8y=1/10
6*1/10+8y=1/10
8y=4/100
y=1/200

How comes 4/100 please explain?

6*1/100 + 8y =1/10
6/100 + 8y = 1/10
8y = (1/10) - (6/100)
on taking lcm =100
8y = (10 -6)/100
8y = 4/100

Haha Siddharth skipping 2nd part of question and getting direct answer with easy way. Very nice dear thanku :).