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3 January, 06:45

Ruben has 6 new books for his collection. This increases his collection by 12%? How many books does he have now?

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  1. 3 January, 09:32
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    Ruben has 6 new books for his collection. This increases his collection by 12%

    Let x be the number of books Ruben has before 6 new books added

    x + 12% of x = x+6

    x + 0.12x = x+6

    1.12 x = x+6

    Subtract x on both sides

    0.12x = 6

    Divide by 0.12

    x = 50

    6 new books are added for his collection

    So 50 + 6 = 56

    He have 56 books now.
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