Time Measurement

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?




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If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

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Can you write down eight eights so that they add up to one thousand?

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Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

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C.It cannot be determined if Jurgen or Edwin is the tallest.

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At a Society election for president, precisely 963 votes were cast.
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What makes this number unique: 8,549,176,320?

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What 5-letter word typed in all capital letters can be read the same upside down?

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What number when divided in half becomes zero?

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Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

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Gambling

In Canada, a mathematical puzzle must be solved in order to win the lottery to classify it as a “game of skill” not gambling.