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

Example Input: Problem: company c sells a line of 20 products with an average retail price of $ 1,200 . if none of these products sells for less than $ 400 , and exactly 10 of the products sell for less than $ 1,000 , what is the greatest possible selling price of the most expensive product ?
Example Output: 11000

Example Input: Problem: if shares of two persons in profits are rs . 600 and rs . 1000 then ratio of their capitals is
Example Output: 3 : 5

Example Input: Problem: a student was asked to find 4 / 5 of a number . but the student divided the number by 4 / 5 , thus the student got 27 more than the correct answer . find the number .
Example Output:
60