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

Input: Consider Input: Problem: find the cost of fencing around a circular field of diameter 16 m at the rate of rs . 3 a meter ?

Output: 150.84

Input: Consider Input: Problem: if | x - 9 | = 3 x , then x = ?

Output: - 4.

Input: Consider Input: Problem: if y exceeds x by 20 % , then x is less than y by ?
Output: 16 2 / 3 %