Question

Mark went to an electronic store, purchased 2 CDs and 6 DVDs, and spent $156. Antonio went to the same store, bought 1 CD and 9 DVDs, and spent $210. How much does each CD sell for at the store? $12

$15

$18

$22

Answer 1

$12

$15

$18

$22

Answer 2

$12

Answer 3

It is 12. If you go:
Mark - 12x2=24 156-24=132 132/6=22
So DvDs are $22
Antonio - 22x9= 198 198+12=210

Answer 4

Thanks!

Answer 5

if cd is x and dvd is y,

2x+6y=156
x+9y=210

2x+18y= 420
- 2x+6y=156
_____________________
12y = 264
y = $22

x+9(22) = 210
x+198=210
x = $12

Answer 6

thanks!