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11 August, 22:10

Two-thirds a numer plus 4 is 7

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  1. 11 August, 22:19
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    Since we don't know the number yet, we'll give it a name.

    That will make it easier to work with.

    It can have any name. I've decided to call it ' Z '.

    - - The number Z

    - - Two thirds of the number 2/3 Z

    - - Two thirds of the number plus 4 2/3 Z + 4

    The question says that makes 7 : 2/3 Z + 4 = 7

    Subtract 4 from each side: 2/3 Z = 3

    Multiply each side by 3 : 2 Z = 9

    Divide each side by 2 : Z = 4.5
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