Amazon.com has been visited by 1m+ users in the past month The question is exactly the same in the ios version of the impossible quiz. The potential answers include 2, 210, a question mark (?) and maths!.
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The impossible quiz question 105
The Impossible Quiz 2
Web question 21 of the impossible quiz book consists of a rather simple division:
Many of the questions have double meanings, tricks and puns and requires you to think outside.
The only difference is that while in the original you can click the correct box without having to wait to see them flash, in the ios version you must.