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

Ex Input:
Problem: i had rs . 10000 with me . out of this , money i lent some money to a for 2 years at 15 % simple interest . i lent the remaining money to b for an equal number of years at 18 % simple interest . after 2 years , i found that a had given me rs . 360 more as interest as compared to ( b ) the amount of money which i had lent to b must have been

Ex Output:
4000


Ex Input:
Problem: a grocer is storing soap boxes in cartons that measure 25 inches by 42 inches by 60 inches . if the measurement of each soap box is 7 inches by 6 inches by 10 inches , then what is the maximum number of soap boxes that can be placed in each carton ?

Ex Output:
150


Ex Input:
Problem: if a ( a + 7 ) = 60 and b ( b + 7 ) = 60 , where a ≠ b , then a + b =

Ex Output:

− 7