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What is the missing number?

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 45

The first user who solved this task is Thinh Ddh.

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On Each Bicep

My wife won’t let me get a tattoo of a grizzly bear on each bicep...
She is infringing on my right to bear arms!

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Coin-op TV

In 1946, the first U.S. coin-operated television to be publicly exhibited was displayed in New York City. It operated when a 25-cent coin was inserted. The receiver, named the Tradio-Vision, contained 20 tubes and a 5-in cathode ray tube that reflected a 500-line image on mirror on the lid of its metal cabinet (16-in high, 8-in deep, 9-in wide). The manufacturer was Tradio Inc., of Asbury Park, N.J.

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