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Question

If $$3$$ men or $$6$$ boys can finish a work in $$20$$ days , then how long will $$4$$ men and $$12$$ boys take to finish the same work ?


A
2 days
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B
4 days
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C
6 days
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D
8 days
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Solution

The correct option is B $$6$$ days
$$3$$ men $$ = 6$$ boys
So, $$1$$ man $$=2$$ boys
$$3$$ men or $$6$$ boys can finish a work in $$20$$ days.
$$4$$ men and $$12$$ boys $$= 4 +6$$ men $$=10$$ men.
$$3$$ men  can finish a work in $$20$$ days.
$$10$$ men can finish the work in $$\dfrac{20\times3}{10}=6$$ days. 

Mathematics

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