18 men bind 900 books in 10 days. Find how many binders will be required to bind 600 books in 12 days?

Question: 18 men bind 900 books in 10 days. Find how many binders will be required to bind 600 books in 12 days?

Solution:
To bind 900 books in 10 days binders needed 18 men
To bind 1 books in 1 days binders needed 180/900 men
To bind 600 books in 12 days binders needed (180 × 600)/(900 × 12) men
= 10 men