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Christine went shopping and bought each of her nine nephews a gift, either a video costing $14.95 or a CD costing $16.88. She spent $142.27 on the gifts. How many videos and how many CDs did she buy?

Respuesta :

texaschic101
v + c = 9....v = 9 - c
14.95v + 16.88c = 142.27

14.95(9 - c) + 16.88c = 142.27
134.55 - 14.95c + 16.88c = 142.27
-14.95c + 16.88c = 142.27 - 134.55
1.93c = 7.72
c = 7.72 / 1.93
c = 4 <=== there were 4 CD's

v + c = 9
v + 4 = 9
v = 9 - 4
v = 5 <=== there were 5 videos

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