algebra 1

A charity fair raised $6,000 by selling 500 lottery tickets. There were two types of lottery tickets: A tickets cost $10 each, and B tickets cost $60 each. How many tickets of each type were sold?

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  1. a + b = 500
    10 a + 60 b = 6000 divide this by ten

    a + b = 500
    a + 6 b = 600
    ------------ subtract
    -5 b = -100

    b = 20
    so a = 480

    check
    480*10 + 20 *60 = 4800 +1200 = 6000 sure enough

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