10 men, working 6 hours a day can complete a work in 18 days. How many hours a day must 15 men work to complete the work in 12 days ?	Choose the correct choice:	A) 4 hours a day	B) 5 hours a day	C) 6 hours a day	D) 7 hours a day	E) 8 hours a day
Explanation:   More Men, Less Hours {Indirect Proportion}   Less Days, More Hours {Indirect Proportion}   [men 15 10   days 12 18] ::6:x   =&gt;x∗15∗12=10∗18∗6   =&gt;x=10∗18∗6/ 15∗12   =&gt;x=6   Option 6 hours a day
<result>C</result>
10 men, working 6 hours a day can complete a work in 18 days. How many hours a day must 15 men work to complete the work in 12 days ?