Grace063001 Grace063001

08-10-2017
Mathematics

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A tape costs $4 less than the CD. Okasha bought 1 CD in five tapes. If the total cost was $70 what was the price of the CD ?

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texaschic101 texaschic101

08-10-2017

c + 5t = 70
t = c - 4

c + 5(c - 4) = 70
c + 5c - 20 = 70
6c - 20 = 70
6c = 70 + 20
6c = 90
c = 90/6
c = 15 <=== cost of a CD

t = c - 4
t = 15 - 4
t = 11 .....cost of a tape

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