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

[EX Q]: Problem: the cost of the paint is rs . 50 per kg . if 1 kg of paint covers 20 sq . ft , how much will it cost to paint outside of a cube having 20 feet each side
[EX A]: rs . 6000

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

[EX Q]: Problem: a train 100 m long takes 6 sec to cross a man walking at 5 kmph in a direction opposite to that of the train . find the speed of the train ?
[EX A]:
55 kmph