Arithmetic Ability
Time and Work

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Q.

A Contractor employed a certain number of workers to finish constructing a road in a certain scheduled time. Sometime later, when a part of work had been completed, he realised that the work would get delayed by three-fourth of the scheduled time, so he at once doubled the no of workers and thus he managed to finish the road on the scheduled time. How much work he had been completed, before increasing the number of workers?

View Answer

Correct choice: B

Explanation:

Let he initially employed x workers which works for D days and he estimated 100 days for the whole work and then he doubled the worker for (100-D) days. D * x +(100- D) * 2x= 175x => D= 25 days Now , the work done in 25 days = 25x Total work = 175x Therefore, workdone before increasing the no of workers = 25x/175x×100 % = 14 2/7%
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