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

[EX Q]: Problem: pipe a can fill a tank in 6 hours . due to a leak at the bottom , it takes 10 hours for the pipe a to fill the tank . in what time can the leak alone empty the full tank ?
[EX A]: 15

[EX Q]: 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 A]: 170', 'c ) 1425', 'd ) 2025', 'e ) 2500'

[EX Q]: Problem: a circular ground whose diameter is 35 metres , has a 1.4 metre - broad garden around it . what is the area of the garden in square metres ?
[EX A]:
160.16