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You can buy 3 post cards for $5.40 , 6 post cards for $10.80 or 9 postcards for $16.20.What is the constant of proportionality for buying post cards?

You can buy 3 post cards for $5.40 , 6 post cards for $10.80 or 9 postcards for $16.20.What is the constant of proportionality for buying post cards?
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1 vote
You can buy 3 post cards for $5.40 , 6 post cards for $10.80 or 9 postcards for $16.20.What is the constant of proportionality for buying post cards?

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User Ummahusla
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8.4k points

2 Answers

6 votes
1 post card is $1.80.
answered
User Bot
by
8.6k points
0 votes
the answer should be buy 1 postcard is $1.80
answered
User SergioFC
by
7.6k points
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