Mathematics, 11.01.2021 22:50, u8p4

When Famke charges her phone, it gains 2 percentage points each minute. When Famke uses her phone, it loses 5 percentage points each minute. Once, Famke used her phone for some time, and then charged it for twice the amount of time she used it. In the end, her phone lost 10 percentage points. How long did Famke use her phone and how long did she charge it?

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When Famke charges her phone, it gains 2 percentage points each minute. When Famke uses her phone, i...