1. If 60 boys can finish a work in 15 days by working 8 hours a day, then how many hours a day should 72 boys work to finish that work within 20 days?
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By: anil on 05 May 2019 02.03 am
Using, $$M_1 imes D_1 imes H_1$$ $$=M_2 imes D_2 imes H_2$$, where $$M$$ is the number of persons, $$D$$ is the number of days and $$H$$ is the number of hours. Let number of hours required = $$h$$ According to ques, => $$60 imes15 imes8=72 imes20 imes h$$ => $$h=frac{60 imes120}{72 imes20}$$ => $$h=frac{360}{72}=5$$ hours => Ans - (C)
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