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

Example Input: Problem: a certain rectangular crate measures 8 feet by 14 feet by 16 feet . a cylindrical gas tank is to be made for shipment in the crate and will stand upright when the crate is placed on one of its six faces . what should the radius of the tank be if it is to be of the largest possible volume ?
Example Output: 6

Example Input: Problem: the diameter of the driving wheel of a bus in 140 cm . how many revolutions per minute must the wheel make in order to keep a speed of 33 kmph ?
Example Output: 125

Example Input: Problem: p , q and r have $ 4000 among themselves . r has two - thirds of the total amount with p and q . find the amount with r ?
Example Output:
160