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If 18 bindres bind 900 books in 10 days , How many binders will be required to bind 660 books in 12 days?

22
14
13
11

Correct Answer: 11

Explanation:

Let the required no of binders be X.

Less books , Less binders (Direct Proportion)

More days, Less binders (Indirect proportion)

$B o o k s 900 : 660 D a y s 12 : 10 ⋮ ⋮ 18 : x$

Therefore, (900 * 12 * x) = (660 * 10 * 18)

=> x = 11

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