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? (2 points) Question 9 options:
1) 10
2) 7
3) 5
4) 2

Answer 1

2C+3D=31
C+D=12
2C+2D=24
D=7, so answer 2)