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

Ex Input:
Problem: a and b are 90 km apart they start to move each other simultaneously a at speed 10 and b at 5 km / hr if every hour they double their speed what is distance that a pass until he meet b ?

Ex Output:
60 km

Ex Input:
Problem: the total age of a and b is 14 years more than the total age of b and c . c is how many years younger than a ?

Ex Output:
14

Ex Input:
Problem: two numbers are in the ratio of 2 : 3 . if 20 be subtracted from each , they are in the ratio of 10 : 17 . find the numbers ?

Ex Output:
70,105