21. 10 women can complete a work in 7 days and 10 children take 14 days to complete the work.
How many days will 5 women and 10 children take to complete the work?
A) 3 B) 5 C) 7D) Cannot be determined
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10 women complete the work in 7 days.
10 children complete the same work in 14 days
∴ 1 woman ≡ 2 children
=> 5 women + 10 children = 20 children
By M1D1 = M2D2
= 10×14 = 20×D2
=>D2 = 10×1420 = 7 days.
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