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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 ?

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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