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

[EX Q]: Problem: how many quarters are equal to 7 dollars ?
[EX A]: 28

[EX Q]: Problem: in a group of 150 readers who read science fiction or literacy works or both , 120 read science fiction and 90 read literacy works . how many read both science fiction and literacy works ?
[EX A]: 60

[EX Q]: Problem: if jack walked 8 miles in 1 hour and 15 minutes , what was his rate of walking in miles per hour ?
[EX A]:
6.4