Question

A contractor takes a contract to construct 800kms road in 40days and employ 100 workers for it.if he wants to complete the work in 30 days, how many workers will he need

Answer 1

let the required worker = X
More length of road ,more worker (direct proportion)
More days, Less workers. (indirect proportion)
Length of road 800 : 800
Days 30 : 40 since indirect proportion)
Worker X : 100
800*30*100=800*40*X
X=(800*100*40)/(800*30)
=400/3
=133.33 =approx 134 worker

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