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

Input: Consider Input: Problem: tourist purchased a total of 30 travelers checks in $ 50 and $ 100 denominations . the total worth of the travelers checks is $ 1800 . how many checks of $ 50 denominations can he spend so that average amount ( arithmetic mean ) of the remaining travelers checks is $ 100 ?

Output: 2


Input: Consider Input: Problem: if 2 men or 3 women can reap a field in 10 days how long will 4 men and 5 women take to reap it ?

Output: 11 / 30


Input: Consider Input: Problem: if 2 ^ 5 , 3 ^ 3 , and 13 ^ 2 are all factors of the product of 936 and w where w is a positive integer , what is the smallest possible value of w ?


Output: 15