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8 children and 12 men complete a certain piece of work in 9 days. If each child takes twice the time taken by a man

8 children and 12 men complete a certain piece of work in 9 days. If each child takes twice the time taken by a man to finish the work, in how many days will 12 men finish the same work ?
a. 8
b. 15
c. 9
d. 12

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