Mathematics, 02.03.2021 03:10 punkinrichard1oxon2i

When Famke charges her phone, it gains percentage points each minute. When Famke uses her phone, it loses 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 percentage points.
How long did Famke use her phone and how long did she charge it?

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