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8 September, 20:08

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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Answers (2)
  1. 8 September, 20:23
    0
    The answer should be buy 1 postcard is $1.80
  2. 8 September, 23:39
    0
    1 post card is $1.80.
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