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27 March, 01:19

Ruben bought six new books for his collection. This increased his collection by 12%. How many books did he have before his purchases?

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  1. 27 March, 02:06
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    20. Let x represent the amount of books he had:

    x + 6 = 1.12x

    Subtract x from both sides:

    6 = 0.12x

    Divide both sides by 0.12; x = 50

    28. $6 + 0.025*$6 = $6 + $0.15 = $6.15
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