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10 May, 07:10

3 plus 6 times the number of white marbles for a total of 15

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  1. 10 May, 08:43
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    The problem is 3+6x = 15 with x being the number of white numbers.

    Isolate variable by subtracting 3 on both sides: 6x = 12.

    Isolate variable by dividing 6 on both sides: x = 2

    The number of white marbles is 2.
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