8 men, working 9 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?	Choose the correct choice from the following options:
A) 6	B) 7	C) 8	D) 9	E) 10
The number of hours required to complete the work is 8*9*24= 
<gadget id="calculator">8*9*24</gadget>
<output>1_728</output>
1728   12 × 16 × (x)= 1728   x = 9   The answer is 9.
<result>D</result>
8 men, working 9 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?