Find First

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3




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Can you find out the number that should replace the question mark with a valid reason?

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If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

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What demands an answer, but asks no questions

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Amazing Facts

Challenging

There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.