In this task, you need to provide the correct option for a given problem from the provided options.
--------
Question: Problem: in a group of 90 students , 36 are taking history , and 32 are taking statistics . if 57 students are taking history or statistics or both , then how many students are taking history but not statistics ? 
Options: a ) 9 , b ) 19 , c ) 25 , d ) 27 , e ) 31

Answer: c


Question: Problem: the ratio between the present age of p and q is 6 : 7 . if q is 4 years old than p , what will be the ratio of the ages of p and q after 4 years ? 
Options: a ) 8 : 7 , b ) 7 : 8 , c ) 8 : 6 , d ) 6 : 7 , e ) 6 : 8

Answer: a


Question: Problem: find the common factors of 15 and 18 . 
Options: a ) 50 , b ) 55 , c ) 60 , d ) 70 , e ) 90

Answer:
e