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

Ex Input:
Problem: if the average ( arithmetic mean ) of a and b is 45 and the average of b and c is 80 , what is the value of c a ?

Ex Output:
60

Ex Input:
Problem: the total age of a and b is 12 years more than the total age of b and c . c is how many year younger than a

Ex Output:
12

Ex Input:
Problem: the value of a machine depreciates at 20 % per annum . if its present value is rs . 1 , 50,000 , at what price should it be sold after two years such that a profit of rs . 30,000 is made ?

Ex Output:
12600