If 36 men can do a piece of work in 25 hours, in how many hours will 10 men do it? Choose the correct choice from the following choices.
A) 22
B) 38
C) 60
D) 88
E) 90
Explanation:   Let the required no of hours be x. Then   Less men , More hours (Indirect Proportion)   \inline \fn_jvn \therefore 10:36 ::25:x \inline \fn_jvn \Leftrightarrow (10 x X)=(36 x 25) \inline \fn_jvn \Leftrightarrow \inline \fn_jvn x=\frac{36\times 25}{10}=90   Hence, 10 men can do it in 90 hours.   Answer: 90) 90
<result>E</result>
If 36 men can do a piece of work in 25 hours, in how many hours will 10 men do it?