Eleven plus two equals one

If eleven plus two equals one, what does nine plus five equal?




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It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

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We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

Gear Rotation Riddle

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A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

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Decode the below four famous ciphers:

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What is it?

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If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

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One is to three as three is to five and five is to four and four is the magic number.
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There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.