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

Input: Consider Input: Problem: a cat chases a rat 6 hours after the rat runs . cat takes 4 hours to reach the rat . if the average speed of the cat is 90 kmph , what s the average speed of the rat ?

Output: 36 kmph


Input: Consider Input: Problem: the curved surface of a sphere is 64 π cm 2 . find its radius ?

Output: 4', 'd ) 9', 'e ) 7'


Input: Consider 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 ?


Output: 11000