Q1: In a dairy farm, 40 cows eat 40 bags of husk in 40 days. In how many days one cow will eat one bag of husk?

ANS:C - 40

Let the required number of days be x. Less cows, More days (Indirect Proportion) Less bags, Less days (Direct Proportion)

Cows	1	:	40		:: 40 : x
Bags	40	:	1

 1 x 40 x x = 40 x 1 x 40  x = 40.