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

Ex Input:
Problem: tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random . what is the probability taht the ticket drawn has a number which is a multiple of 3 or 5 ?

Ex Output:
9 / 20


Ex Input:
Problem: how many integers n are prime numbers in the range 200 < n < 220 ?

Ex Output:
1


Ex Input:
Problem: a man can row at 5 kmph in still water . if the velocity of current is 3 kmph and it takes him 1 hour to row to a place and come back , how far is the place ?

Ex Output:

1.6 k