Question

A contractor with a work force of 420 men can complete a work of construction of
a building in nine months. Due to request by the owners he was asked to complete
the job in seven months. How many extra men he must employ to complete the job?
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Answer 1

Answer:

120 extra men

Explanation:

For 420 worker if it takes 9 months then men needed to complete that work in 7months is 420 *9/7=540 it is an indirect variation because if more workers are there the no of days to complete that work is lesser as 540 men are needed 540-420that is 120 men extra should be alotted

Answer 2

120 extra man are needed to complete the job in 7 months as 420*9/7 so answer is 540
540-420 answer is 120