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16 May, 00:51

A concert is charging $5.50 for adult tickets and $4.00 for kids under 12 years of age. 70 tickets were sold fora total of $310. How many of the tickets were adult tickets and how many were sold to kids under 12?

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  1. 16 May, 03:41
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    The answer is: Number of adult tickets: 20. Number kid's tickets: 50.

    Step-by-step explanation:

    5.50a + 4.00k = 310

    a + k = 70

    a = 70 - k

    5.50 (70-k) + 4.00k = 3.10

    385 - 5.5k + 4k = 310

    -1.5k = 310 - 385

    -1.5k = - 75

    k = - 75 / - 1.5 = 50

    Find the number of adult tickets:

    a + 50 = 70

    a = 20

    Proof:

    5.50 (20) + 4.00 (50) = 3.10

    110 + 200 = $310
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