ktosmiley ktosmiley

19-02-2018
Mathematics

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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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Alwd234 Alwd234

20-02-2018

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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