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

Example Input: Problem: in the third grade of windblown school there are 90 students , one third of them failed the math test and 1 / 6 failed that literature test . at least how many students failed both tests ? 
Options: a ) 0 . , b ) 6 . , c ) 8 . , d ) 10 . , e ) 12 .
Example Output: a

Example Input: Problem: there are 680 students in a school . the ratio of boys and girls in this school is 3 : 5 . find the total of girls & boys are there in this school ? 
Options: a ) 425 , b ) 345 , c ) 375 , d ) 380 , e ) 400
Example Output: a

Example Input: Problem: the ratio of three numbers is 3 : 4 : 5 and the sum of their squares is 1250 . the sum of the numbers is ? 
Options: a ) 2 , b ) 3 , c ) 4 , d ) 6 , e ) 5
Example Output:
e