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Chain Rule - General Aptitude

Q1:

36 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work?

A 12

B 18

C 22

D 24

E None of these

ANS:D - 24

Let the required number of days be x. Less men, More days (Indirect Proportion)  27 : 36 :: 18 : x        27 x x = 36 x 18

 x = 36 x 18
27
 x = 24.