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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 ?

4 hours a day
5 hours a day
6 hours a day
7 hours a day

Correct Answer: 6 hours a day

Explanation:

More Men, Less Hours {Indirect Proportion}

Less Days, More Hours {Indirect Proportion}

$m e n 15 : 10 d a y s 12 : 18 ⋮ ⋮ 6 : x$

=> 15 * 12 * x = 10 * 18 * 6

=>x = 6

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