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Time and Work - General Aptitude

Q1:

Twenty women can do a work in sixteen days. Sixteen men can complete the same work in fifteen days. What is the ratio between the capacity of a man and a woman?

A 3 : 4

B 4 : 3

C 5 : 3

D Data inadequate

ANS:B - 4 : 3

(20 x 16) women can complete the work in 1 day.

 1 woman's 1 day's work = 1 .
320
(16 x 15) men can complete the work in 1 day.
 1 man's 1 day's work = 1
240
So, required ratio
= 1 : 1
240 320
 
= 1 : 1
3 4
  = 4 : 3 (cross multiplied)