Question

If 18 binders can bind 900 books in 10 days .how many binders will be required to bind 660 books in 12 days?

Answer 1

900-----10----18
1---------10-----18/900
1----------1-----18/900*10
660 books------1 day----1/5*660 binders
660 books-----12days----132/12=11 binders..


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Answer 2

Let the required no of binders be X.

Less books , Less binders (Direct Proportion)

More days, Less binders (Indirect proportion)

Books 900:660 Days 12 : 10 }⋮⋮ 18:x

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

=> x = 11