Question: 8 men can dig a pit in 20 days. If a man works half as much again as a boy, then 4 men and 9

8 men can dig a pit in 20 days. If a man works half as much again as a boy, then 4 men and 9 boys can dig a similar pit in :
a. 10 days
b. 12 days
c. 15 days
d. 16 days

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