instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: if 1.5 cm of a pencil is purple , 0.5 cm of the remaining is black and the remaining 2 cm is blue , what is the total length of the pencil ?
answer:
4 cm

question:
Problem: if the sides of a triangle are 26 cm , 24 cm and 15 cm , what is its area ?
answer:
180

question:
Problem: what is the rate percent when the simple interest on rs . 720 amount to rs . 180 in 4 years ?
answer:
6.25