Question

A certain number of people can complete can complete a piece of work in 12 days working 5 hours a day. If thenumber of men is decreased by half, how many hours a day should they work, so that the work is to be completed in 15 days ?
A. 10
B. 9
C. 8
D. 6

Answer 1

Correct Answer - C
(i) Use variation method.
(ii) Consider the number of men as x in first case. Therefore, the number of men in second case is x/2.
Use `(M_(1)D_(1)H_(1))/(W_(1))=(M_(2)D_(2)H_(2))/(W_(2))` and find `H_(2)`