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