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

Example Input: Problem: a square with sides of 15 units each . what would be the area of the square . consider a square as a combination of two right angled triangles .
Example Output: 225', 'd ) 81', 'e ) 144'

Example Input: Problem: how much interest will $ 10,000 earn in 9 months at an annual rate of 4 % ?
Example Output: $ 300

Example Input: Problem: the hcf of two numbers is 42 and the other two factors of their lcm are 10 and 20 . what is the largest number .
Example Output:
840