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

[Q]: Problem: by selling an article at rs . 600 , a shopkeeper makes a profit of 25 % . at what price should he sell the article so as to make a loss of 25 % ?
[A]: s . 360

[Q]: Problem: if the radius of a circle is decreased 60 % , what happens to the area ?
[A]: 84 % decrease

[Q]: Problem: the sum of ages of 5 children born at the intervals of 3 years each is 55 years . what is the age of the youngest child ?
[A]:
5 years