Homework Question?

You ask 130 high school students how they earn money. 48 students babysit, 32 bag groceries , 28 do yard work, and 12 have after school office jobs. Each student who works at these jobs does only one kind if job, except for 15 who baby sit and also do yard work.

(A)- How many students babysit, do yard work, or do both?

(B)- How many do not have any of the jobs listed above?

Thanks!