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

Example Input: Problem: a train passes a platform in 32 seconds . the same train passes a man standing on the platform in 20 seconds . if the speed of the train is 54 km / hr , the length of the platform is
Example Output: 180 meter

Example Input: Problem: what decimal fraction is 90 ml of a litre ?
Example Output: . 09

Example Input: Problem: a sports retailer ordered white and yellow tennis balls in equal number but the dispatch clerk of the tennis ball company erred and dispatched 50 extra yellow balls and making ratio of white balls to yellow balls 8 / 15 . how many tennis balls did the retailer order originally .
Example Output:
114.28