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Mathematics, 10.12.2019 10:31 billlyyyyyyyyyy

Mark asked his sister for $10. she gave him x4 times that because thats all she had in dollars at the moment. mark gave her back $20. what did he do wrong and why? use numbers, letters, and\or any other strategy to you out.

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Mark asked his sister for $10. she gave him x4 times that because thats all she had in dollars at th...
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