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

Ex Input:
Problem: the ratio of a to b is 4 to 5 , where a and b are positive . if x equals a increased by 25 percent of a , and m equals b decreased by 60 percent of b , what is the value of m / x ?

Ex Output:
2 / 5


Ex Input:
Problem: a is twice as good a workman as b and they took 6 days together to do the work b alone can do it in .

Ex Output:
18 days


Ex Input:
Problem: if the cost price of 18 articles is same as the selling price of 25 articles . find the gain or loss percentage ?

Ex Output:

28 % loss