1. 45 men or 60 boys can do a piece of work in 20 days. How many days will 15 men and 20 boys take to complete the work?
Write Comment
Comments
By: anil on 05 May 2019 01.46 am
Let work done by 1 man in 1 day = $$m$$ and work done by 1 boy in 1 day = $$b$$ => Work done by 45 men in 1 day = $$frac{1}{20}$$ => $$45m=frac{1}{20}$$ => $$m=frac{1}{900}$$ Similarly, work done by 60 boys = $$60b=frac{1}{20}$$ => $$b=frac{1}{1200}$$ Thus, work done by 15 men and 20 boys in 1 day = $$15m+20b$$ = $$15(frac{1}{900})+20(frac{1}{1200})$$ = $$frac{1}{60}+frac{1}{60}=frac{2}{60}=frac{1}{30}$$ $$ herefore$$ Time taken by 15 men and 20 boys to complete the work = 30 days => Ans - (C)
Terms And Service:We do not guarantee the accuracy of available data ..We Provide Information On Public Data.. Please consult an expert before using this data for commercial or personal use