instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: by selling an article for $ 195 , a person gains $ 45 . what is the gain % ?
answer:
30 %


question:
Problem: a student committee on academic integrity has 132 ways to select a president and vice president from a group of candidates . the same person can not be both president and vice president . how many candidates are there ?
answer:
1


question:
Problem: set s consists of integers { 8 , 11 , 12 , 14 , 15 } . if integer n is included in the set , the average ( arithmetic mean ) of set s will increase by 25 % . what is the value of integer n ?
answer:

40