Question

A contractor with a work force of 420 men can complete a work of construction of
-an, 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​

Answer 1

Answer:

540men are required if he wants to complete within 7 months

Step-by-step explanation:

420 men complete the work in=9 months

so,in 9 months the work is completed by=420men

Therefore in 1 month the is completed by=420×9 men

Therefore in 7 months the work is done by=420×9/7

=540