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Answer with Explanation:

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 ) = (1/14 +1/14)= 1/7

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