The task is to generate the correct answer for a given math problem.

Input: Consider Input: Problem: the area of a triangle is with base 10 m and height 5 m ?

Output: 25

Input: Consider Input: Problem: by selling an article for $ 225 a person gains $ 75 . what is the gain % ?

Output: 50 %

Input: Consider Input: Problem: find the result of equation of the ellipse whose foci are at ( 0 , - 5 ) and ( 0 , 5 ) and the length of its major axis is 14 .
Output: