8 men, working 8 hours a day can complete a work in 24 days. How many hours a day must 12 men work to complete the same work in 16 days?
Choices.
A) 6  B) 7  C) 8  D) 9  E) 10

Rationale: "the number of hours required to complete the work is 8 * 8 * 24 = 1536 12 × 16 × ( x ) = 1536 x = 8 the answer is c ."
Answer: C