If 36 men can do a piece of work in 5 hours, in how many hours will15 men do it?  Choose the correct choice from the following options.
A) 12  B) 38  C) 60  D) 88  E) 72
Explanation:   Let the required no of hours be x. Then   Less men , More hours (Indirect Proportion)   \inline \fn_jvn \therefore 15:36 ::5:x \inline \fn_jvn \Leftrightarrow (15 x X)=(36 x 5) \inline \fn_jvn \Leftrightarrow \inline \fn_jvn x=\frac{36\times 5}{15}=12   Hence, 15 men can do it in 12 hours.   12nswer: 12) 12
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If 36 men can do a piece of work in 5 hours, in how many hours will15 men do it?