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

[EX Q]: Problem: how many prime numbers are between 51 / 13 and 89 / 9 ?
[EX A]: 2

[EX Q]: Problem: a can do a piece of work in 22 days and b alone can do it in 10 days . b works at it for 5 days and then leaves . a alone can finish the remaining work in
[EX A]: 11 days

[EX Q]: Problem: 2 percent of 2 2 =
[EX A]:
0.05