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

Ex Input:
Problem: a diagonal of a polygon is an segment between two non - adjacent vertices of the polygon . how many diagonals does a regular 20 - sided polygon have ?

Ex Output:
170', 'c ) 1425', 'd ) 2025', 'e ) 2500'


Ex Input:
Problem: two cubes have their volumes are in the ratio 1 : 27 . find the ratio of their surface area ?

Ex Output:
1 : 9', 'd ) 2 : 7', 'e ) 3 : 11'


Ex Input:
Problem: 2 persons can finish a job in 8 days . first person alone can finish the work in 24 days . how many days does the second person take to finish the job ?

Ex Output:

12 days