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

Ex Input:
Problem: two trains of length 100 meters and 200 meters are 450 meters apart . they are moving towards each other on parallel tracks , at speeds of 90 km / h and 72 km / h . after how many seconds will the trains meet ?

Ex Output:
10


Ex Input:
Problem: a cycle is bought for rs . 900 and sold for rs . 1170 , find the gain percent ?

Ex Output:
30 %


Ex Input:
Problem: the length of a rectangular garden is 2 feet longer than 3 times its width . if the perimeter of the garden is 100 feet , find the length of the garden .

Ex Output:

38', 'c ) 28', 'd ) 57', 'e ) 49'