21 binders can bind 1400 books in 15 days. How many binders will required to bind 800 books in 20 days?
- 7
- 9
- 5
- 3
Explanation
21 binders bind 1400 books in 15 days, so 1 binder binds:
1400/21 = 66.67 books in 15 days
= 66.67/15 = 4.44 books per day
To bind 800 books in 20 days, we need:
800/20 = 40 books per day
Number of binders required = 40/4.44 = 9
So, 9 binders are required to bind 800 books in 20 days.
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