algebra

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an orange has 20 fewer calories than a banana. If 7 bananas have the same number of calories as 9 oranges, how many calories are in a banana?

  • algebra -

    Let X be the number of calories in a banana, and Y be the number in an orange.
    7X = 9Y
    7X - 9Y = 0
    X - Y = 20
    9X - 9Y = 180
    2X = 180
    X = 90
    Y = X -20 = 70

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