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) 7 days

B) 9 days

C) 11 days

D) 13 days

1 woman's 1 day's work = 1/70

1 child's 1 day's work = 1/140

(5 women + 10 children)'s day's work = (5/70 + 10/140)

= 1/7

5 women and 10 children will complete the work in 7 days.

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