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Maths

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A girl buys x magazines at 50p each and x-3 magazines at 40p each. She spends £6 in all. Find x?

  • Maths - ,

    just add up the costs:

    50x + 40(x-3) = 600
    50x + 40x - 120 = 600
    90x = 720
    x = 8

  • Maths - ,

    0.5x + 0.4(x-3) = 6

    0.5x + 0.4x - 1.2 = 6

    0.9x = 7.2

    x = 8

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