Question

A contractor with a work force of 420 men can complete construction of a building in 9 months. Due to request by the owner he was asked to complete the job in 7 months. How many extra men he must employ to complete the job?​

Answer 1

Answer:

120

Step-by-step explanation:

No of works -420

No of days they take to complete work=270

No of days work needs to be done by=210

No of works to do work in 210 day= 220*270/210=540

No of extra workers required=540-420=120

Answer 2

Answer:

Step-by-step explanation:

Let work to be done be x

Time taken by 420 persons to complete the work. x= 9 months

x= 420×9 = 3780

People required to complete the work in 9 months= x÷7= 3780÷ 7

3780÷7 = 540

Therefore, the contractor had to employ 540 people more to complete the job.

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