A contractor who had a work force of 630 persons, undertook to complete a portion of a stadium in 14 months. He was asked to complete the job in 9 months. How many extra persons had he to employ?

Let work to be done be x

Time taken by 630 persons to complete x= 14 months

x= 630*14=8820

People required to complete the work in 9 months= x/9= 980

Therefore, the contractor had to employ 350 people more to complete the work

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