9. 12 men or 15 women can finish a work in 24 days. In how many days the
same work can be finished by 8 men and 8 women?
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Answer:
12 men did the work in 24 day.
So 1 men will do this work in 12×24 =288 day.
8 men will do this work in 288/8=36day
8 men will do 1/36 of the work in 1 day.
Like this ; 15 women did the work in 24 day….1 women will take 15×24=360day. 8 women will do this work in 360/8=45day.
8 women will do 1/45 of the work in 1 day.
So 8 men & 8 women will do this work in 1 day=1/36+1/45=1/20 of the work.
8 men & 8 women will finish the work in 1÷1/20=1×20/1=20 days
Explanation:
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