Task: Question Answering
Input (English): Problem: set s consists of integers { 4 , 7 , 10 , 14 , 15 } . if integer n is included in the set , the average ( arithmetic mean ) of set s will increase by 50 % . what is the value of integer n ? 
Options: a ) 28 , b ) 32 , c ) 36 , d ) 40 , e ) 44
Output (English): d