1. 18 men or 25 boys can complete a work in 25 days. How many days will 36 men and 10 boys will take to complete the work?
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By: anil on 05 May 2019 02.03 am
Let time taken by 1 man to complete unit work = $$m$$ and by 1 boy = $$bb$$ 18 men complete the work in 25 days, => $$m=frac{1}{25 imes18}$$ Similarly, $$b=frac{1}{25 imes25}$$ Now, time taken by 36 men and 10 boys to complete unit work = $$36m+10b$$ = $$(36 imesfrac{1}{25 imes18})+(10 imesfrac{1}{25 imes25})$$ = $$frac{2}{25}+frac{2}{125}$$ = $$frac{10+2}{125}=frac{12}{125}$$ $$ herefore$$ No. of days taken to finish the work = $$frac{125}{12}$$ => Ans - (B)
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