A pack of gum costs 75 cents. That is 3 cents less than three times what the pack cost 20 years ago. Which equation could be used to find the cost of the gum 20 years ago?

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asked Apr 15, 2018 118k views

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A pack of gum costs 75 cents. That is 3 cents less than three times what the pack cost 20 years ago. Which equation could be used to find the cost of the gum 20 years ago?

Mathematics
middle-school

Jyoseph asked

by Jyoseph

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2 Answers

3 votes

75=3c-3
(c stands for cost 20 years ago)

TMacGyver answered Apr 17, 2018

by TMacGyver

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4 votes

let's assume the cost 20 years ago equals x

3x - 3 = 75

or

x = 75 / 3 + 3

Rafiki answered Apr 22, 2018

by Rafiki

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