Question

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

Answer 1

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

Books 900:660

Days 12 : 10 ⋮⋮ 18:x

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

=> x = 11

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