10 men, working 8 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 ?  Choices: 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
8 hours a dayxplanation:   More Men, Less Hours {Indirect Proportion}   Less Days, More Hours {Indirect Proportion}   [men 15 10   days 12 18] ::8:x   =&gt;xâˆ—15âˆ—12=10âˆ—18âˆ—8   =&gt;x=10âˆ—18âˆ—8/ 15âˆ—12   =&gt;x=8   Option 8 hours a day
<result>E</result>
10 men, working 8 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 ?