30 binders can bind 1400 books in 21 days. How many binders will be required to bind 1600 books in 20 days?	Choose the correct choice from the following
A) 87
B) 18
C) 17
D) 36
E) 10

Rationale: binders books days 30 1400 21 x 1600 20 x / 30 = ( 1600 / 1400 ) * ( 21 / 20 ) = > x = 36 answer : d
Answer: D