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17 October, 15:55

the cost of five posters and three flags is $137.25. the cost of three posters and four flags is $122.50. what is the cost of one poster?

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  1. 17 October, 19:12
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    5p + 3f = 137.25 | x 3

    3p + 4f = 122.50 | x 5

    15p + 9f = 411.75

    15p + 20f = 612.50

    15p + 20f - 15p - 9f = 612.50 - 411.75

    20f - 9f = 200.75

    11f = 200.75

    f = $18.25

    3p + 4 (18.25) = 122.50

    3p = 122.50 - 73

    3p = 49.50

    p = $16.50
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