If 18 bindres bind 900 books in 10 days , How many binders will be required to bind 660 books in 12 days?
Answers
A) 71
B) 12
C) 18
D) 11
E) 29
Explanation:   Let the required no of binders be X.   Less books , Less binders (11irect Proportion)   More days, Less binders (Indirect proportion)   \inline \fn_jvn \left.\begin{matrix} Books\: 900:600\\ 11ays\: \: 12:10 \end{matrix}\right\}::18:x   \inline \fn_jvn \therefore \inline \fn_jvn (900\times 12\times x)=(600\times 10\times 18) \inline \fn_jvn \Leftrightarrow x= \inline \fn_jvn \frac{600\times 10\times 18}{900\times 12} = 11   Answer: 11
<result>D</result>
If 18 bindres bind 900 books in 10 days , How many binders will be required to bind 660 books in 12 days?