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

Ex Input:
Problem: students at a school were on average 180 cm tall . the average female height was 170 cm , and the average male height was 182 cms . what was the ratio of men to women ?

Ex Output:
5 : 1


Ex Input:
Problem: twice the larger of two numbers is 3 more than 5 times the smaller , and the sum of 4 times the larger and 3 times the smaller is 71 . what are the numbers ?

Ex Output:
14


Ex Input:
Problem: to complete a work a and b takes 8 days , b and c takes 12 days , a , b and c takes 6 days . how much time a and c will take

Ex Output:

8 days