8 men working for 9 hours a day can complete a piece of work in 20 days. In how many days can 7 men working for 10 hours a day complete the same piece of work?
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Class 11
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>>8 men working for 9 hours a day can comp
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8 men working for 9 hours a day can complete a piece of work in 20 days. In how many days can 7 men working for 10 hours a day complete the same piece of work?
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Correct option is D)
8 men working for 9 hours a day can complete a piece of work in 20 days
8 men working for 1 hour a day can complete the work in (20 x 9) days (Less hours, More days)
1 man working for 1 hour a day can complete the work in (20 x 9 x 8) days (Less men, more days)
1 man working for 10 hours a day can complete the work in (
10
20×9×8
) days
7 men working for 10 hours a day can complete the work in (
7×10
20×9×8
) days =
7
144
days = 20
7
4
days