instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: if the radius of a circle is decreased 60 % , what happens to the area ?
answer:
84 % decrease

question:
Problem: a train covers a distance of 100 km in 1 hour . if its speed is decreased by 10 km / hr , the time taken by the car to cover the same distance will be ?
answer:
1 hr 6 min

question:
Problem: the diagonals of a rhombus are 15 cm and 20 cm . find its area ?
answer:
150