Question

Phillip bought 12 used CDs and DVDs. CDs cost $2 each and DVDs cost $3 each. He spent $31 not including tax. How many DVDs did Phillip buy? How would I solve it?

Answer 1

I think it might be 7?

Answer 2

let the number of cd's be x and dvd's be y

x+y=12
2x+3y=31

now solve

you are right