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

[EX Q]: Problem: of 30 applicants for a job , 9 had at least 4 years ' experience , 18 had degrees , and 3 had less than 4 years ' experience and did not have a degree . how many of the applicants had at least 4 years ' experience and a degree ?
[EX A]: 10

[EX Q]: Problem: if the sides of a cube are in the ratio 5 : 3 . what is the ratio of their diagonals ?
[EX A]: 5 : 3'

[EX Q]: Problem: a man swims downstream 90 km and upstream 55 km taking 5 hours each time ; what is the speed of the current ?
[EX A]:
3.5