Question

2. A record store is going out of business and sold any

cassette for $6.00 and any CD for $12.00. If they sold
20 items for $192, how many of each did they sell?

Answer 1

A) c + CD = 20

B) 6c + 12CD = 192

Multiplying equation A by -6 we get:

A) -6c -6CD = -120

B) 6c + 12 CD = 192

Adding the equations we get

0 + 6 CD = 72

There are 12 CD's and

c + 12 = 20

There are 8 cassettes

Explanation: