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

Ex Input:
Problem: you collect baseball cards . suppose you start out with 15 . maria takes half of one more than the number of baseball cards you have . since you ' re nice , you give peter 1 baseball card . since his father makes baseball cards , paul decides to triple your baseball cards . how many baseball cards do you have at the end ?

Ex Output:
18


Ex Input:
Problem: in a village of 2,500 people , 800 people are over 70 years old and 850 people are female . it is known that 40 percent of the females are younger than 70 years old . if no one in the village is 70 years old , what is the probability that a person chosen at random is either a male or younger than 70 years old ?

Ex Output:
199 / 250


Ex Input:
Problem: the simple form of the ratio 4 / 3 : 2 / 5 is ?

Ex Output:

10 : 3