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

[Q]: Problem: a can do a work in 15 days and b in 20 days . if they work on it together for 7 days , then the fraction of the work that is left is
[A]: 11 / 6


[Q]: Problem: carl is facing very difficult financial times and can only pay the interest on a $ 10,000 loan he has taken . the bank charges him a quarterly compound rate of 8 % . what is the approximate interest he pays annually ?
[A]: 3500


[Q]: Problem: when a certain number x is divided by 61 , the remainder is 24 . what is the remainder when x is divided by 5 ?
[A]:
4