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If 9 men working 6 hours a day can do a work in 88 days. Then 6 men working 8 hours a day can do it in how many days?

89
99
86
76
Explanation:

If men is fixed,work is proportional to time. If work is fixed, then time is inversely proportional to men therefore, (M1 $\times$ T1/W1)=(M2 $\times$ T2/W2) From the above formula i.e (m1 $\times$ t1/w1)=(m2 $\times$ t2/w2) so (9 $\times$ 6 $\times$ 88/1)=(6 $\times$ 8 $\times$ d/1) on solving, d=99 days.

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