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

[EX Q]: Problem: in a school 20 % of the boys are same in number as 1 / 4 th of the girls . what is the ratio of boys to the girls in the school ? 
Options: a ) 5 : 4 , b ) 2 : 3 , c ) 1 : 4 , d ) 3 : 7 , e ) 2 : 5
[EX A]: a

[EX Q]: Problem: what is the square root of 625 , divided by 5 ? 
Options: a ) 9 , b ) 36 , c ) 5 , d ) 6 , e ) 1
[EX A]: c

[EX Q]: Problem: all numbers from 1 to 200 ( in decimal system ) are written in base 6 and base 7 systems . how many of the numbers will have a non - zero units digit in both base 6 and base 7 notations ? 
Options: ['a ) 143', 'b ) 200', 'c ) 157', 'd ) 122', 'e ) 132']
[EX A]:
a