A contractor employed 210 men to build a house in 60 days . After 12 days , he was joined by 70 more men. in how many days willthe remaining worh be finished?
no.of days taken by 210 men to complete the full work =60 days
work completed in 12 days = 1/5 of full work
no. of days taken by 210 men to complete (4/5 of full work)# =60-12=48 days
no. of days taken by 1 man to complete 4/5 of full work=210*48
no. of days taken by (210+70)=280 men to complete 4/5 of full work=210*48/280=36 days
#4/5 of the full work refers to the remaining work to be completed.
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