9 men working 7 hours a day can complete a piece of work in 15 days. How many days can 6 men working for 9 hours a day, complete the same piece of work?	Choose the most appropriate option:	A) 15 ¾ days	B) 16 days	C) 16 ¾ days	D) 17 ½ days	E) 18 days
Explanation:   1 work done = 9 × 7 × 15   9 × 7 × 15 = 6 × 9 × ? days   ? days = 9 × 7 × 15/6 × 9   = 35/2 = 17 ½ days.   Answer: Option 17 ½ days
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9 men working 7 hours a day can complete a piece of work in 15 days. How many days can 6 men working for 9 hours a day, complete the same piece of work?