Algebra
posted by Anonymous on .
Of 30 runners surveyed, 22 go running in the morning and 15 go running in the evening. Seven of the runners surveyed go running in both the morning and the evening. How many runners go running in the morning but not the evening?

By the way I think that the answer is 8. Is it correct?


But still i do not get it! Please explain!

The question asks how many only run in the morning. Since 22 run in the morning and 7 run both times, subtract 7 from 22.