From a book:
As far as I'm concerned, やさしい can mean either easy or gentle. However, the kanji used for each is different: 易しい and 優しい, respectively. That is, you wouldn't use 優しい in あの問題は優しい, right?
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This is almost certainly an erratum.
The Kojien dictionary explicitly mentions that the meaning of 'easy' is written as 易しい:
Wikipedia agrees, for whatever that is worth. What book is this from?