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

Example Input: Problem: the sum of ages of 5 children born 1 years different each is 30 years . what is the age of the elder child ?
Example Output: 8

Example Input: Problem: a salt manufacturing company produced a total of 2000 tonnes of salt in january of a particular year . starting from february its production increased by 100 tonnes every month over the previous months until the end of the year . find its ave 66 rage daily production for that year ?
Example Output: 83

Example Input: Problem: a certain rectangular crate measures 6 feet by 8 feet by 10 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:
4