In this task, you need to provide the correct option for a given problem from the provided options.

Input: Consider Input: Problem: the ratio of toddlers to infants at a day care center is 7 to 3 . if 12 more infants join the day care to change the ratio to 7 to 5 , how many toddlers are there at this day care center ? 
Options: a ) 24 , b ) 36 , c ) 42 , d ) 72 , e ) 120

Output: c


Input: Consider Input: Problem: the ratio of three numbers is 1 : 2 : 3 and the sum of their squares is 2016 . the sum of the numbers is ? 
Options: a ) a ) 10 , b ) b ) 12 , c ) c ) 15 , d ) d ) 14 , e ) e ) 9

Output: b


Input: Consider Input: Problem: there are 30 students in a classroom . the ratio of the # of girls to boys was 1 : 2 , how many boys are there ? 
Options: a ) 10 , b ) 15 , c ) 20 , d ) 25 , e ) 30


Output: c