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

[Q]: Problem: a circular ground whose diameter is 70 metres , has a 2.8 metre - broad garden around it . what is the area of the garden in square metres ?
[A]: 640.64


[Q]: Problem: by selling an article for $ 225 a person gains $ 75 . what is the gain % ?
[A]: 50 %


[Q]: Problem: how many cubes of 10 cm edge can be put in a cubical box of 1 m edge ?
[A]:
1000