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30 May, 04:43

At the movie theater, child admission is $5.10 and adult admission is $8.70 on Sunday, 138 tickets were sold for a total sales of $995.40 how many adults tickets were sold that day

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  1. 30 May, 04:57
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    C + a = 138 ... c = 138 - a

    5.10c + 8.70a = 995.40

    5.10 (138 - a) + 8.70a = 995.40

    703.80 - 5.10a + 8.70a = 995.40

    -5.10a + 8.70a = 995.40 - 703.80

    3.60a = 291.60

    a = 291.60/3.60

    a = 81 <===
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