12 men and 15 women can do a piece of work in 21 days. Find the number of days required to complete the same work by 6 men and 15women
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Answer:
18 days
Step-by-step explanation:
12 men take 21 days to complete a piece of work. 1 man takes (12 × 21) = 252 days.
15 women take 21 days to complete a piece of work. 1 woman takes (15 × 21) = 315 days.
In 1 day, 1 man does (1/252) of the work.
In 1 day, 1 woman does (1/315) of the work.
In 1 day, 6 men and 10 women can do 6(1/252) + 10(1/315) = (1/18) of the work.
(1/18) of the work done in 1 day.
18(1/18) of the work done in 18 days.
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