instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: find the principle on a certain sum of money at 9 % per annum for 2 2 / 5 years if the amount being rs . 1120 ?
answer:
921.0

question:
Problem: in an election between two candidates , one got 60 % of the total valid votes , 30 % of the votes were invalid . if the total number of votes was 9000 , the number of valid votes that the other candidate got , was :
answer:
2520

question:
Problem: the sum of ages of 5 children born 1 years different each is 30 years . what is the age of the elder child ?
answer:
8