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

Example Input: Problem: by selling an article for $ 195 , a person gains $ 45 . what is the gain % ?
Example Output: 30 %

Example Input: Problem: triangle atriangle b are similar triangles with areas 2023 units square and 1792 units square respectively . the ratio of there corresponding height would be
Example Output: 17 : 16

Example Input: Problem: 892.7 – 573.07 – 95.007 = ?
Example Output:
224.623