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

[EX Q]: Problem: ? x 12 = 173 x 240
[EX A]: 3460

[EX Q]: Problem: the ratio of the radius of two circles is 1 : 3 , and then the ratio of their areas is ?
[EX A]: 1 : 9

[EX Q]: Problem: a sum of money becomes 7 / 6 of itself in 7 years at a certain rate of simple interest . the rate per annum is ?
[EX A]:
50 / 21