John took out a loan for 51 months but paid it in full after 31 months. Find the refund fraction he should use to calculate the amount of his refund.

would it be 51/31?

3 answers

or x/31?
lots of missing information

What was the rate of interest?
Did he make any monthly payments?
Did he make not payments except the one at the end of 31 months?
I think the question wants to see how we would go about getting the answer.