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7 February, 17:41

Your friend's piano lesson lasts 15 minutes longer than your piano lesson. You have 6 lessons per month and your friend has 4 lessons per month. At the end of the month, your time spent at piano lessons is the same as your friend's time. How many minutes is your friend's piano lesson?

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  1. 7 February, 18:28
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    Assume your friend piano time is x min, so your piano time is x-15 min.

    6 * (x-15) = 4x

    6x-6*15=4x

    6x-4x=90

    2x=90

    x=45 min
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