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

[Q]: Problem: when the price of a product was decreased by 20 % , the number sold increased by 60 % . what was the effect on the total revenue ?
[A]: 28 %


[Q]: Problem: the sum of two consecutive numbers is 37 . what are they ?
[A]: 18 and 19


[Q]: Problem: what is the range of all the roots of | x ^ 2 - 4 | = x ?
[A]:
3