CBSE Class 8 Answered
A contractor with a work force of 420mens 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?
Asked by narenderrohila75 | 16 Sep, 2018, 08:24: PM
Expert Answer
Let a be the extra number of men employed to complete the work in 7 months.
Number of men 420 a
Months 9 7
As we know,
the number of men hired and the time required to finish the piece of work are inversely proportional.
Therefore,
420 × 9 = a × 7
a = 540
Thefefore, the number of extra men required to complete the job in 7 months = 540 - 420 = 120
Answered by Yasmeen Khan | 17 Sep, 2018, 02:43: PM
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