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

Input: Consider Input: Problem: the ratio of the radius of two circles is 1 : 3 , and then the ratio of their areas is ?

Output: 1 : 9


Input: Consider Input: Problem: 10 women can complete a work in 5 days and 10 children take 10 days to complete the work . how many days will 5 women and 10 children take to complete the work ?

Output: 5


Input: Consider Input: Problem: 50 % of a number is added to 200 , the result is the same number . find the number ?


Output: 400