29. 4 boys can do a piece of work in 5 days, then
how many days will by 7 boys take to complete
the same work?
(a) 15 (1) 1 / 3 (c) 28
[d) 2 1 / 2 (e) None of these
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Answer:
no. of boys: 4 7
no. of days: 5 x
It is the case of inverse variation:
=4×5=7×x
=x=4×5/7
=x=20/7
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