4. 24 men working at 8 hours per day can do a piece of work in 15 days. In how many days 20 men working 9 hours per day do the same work?
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Given 24 men working 8 hours per day can do a work in 15 days. So, 24 men working at 8 hours per day can do 2880 units of work in 15 days. So, 20 men working at 9 hours per day do the same work in 16 days. Hence, the correct option is Option B.
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Given 24 men working 8 hours per day can do a work in 15 days. So, 24 men working at 8 hours per day can do 2880 units of work in 15 days. So, 20 men working at 9 hours per day do the same work in 16 days. Hence, the correct option is Option B.
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