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MATH PUZZLE: Can you replace...

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

Correct answers: 181

The first user who solved this task is Erkain Mahajanian.

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In the beginning, God created...

In the beginning, God created the heaven and the earth... After that, everything else was made in China.

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Touch-Tone push button telephone

In 1963, the first telephone in the U.S. with push buttons instead of a rotary dial was placed in commercial service in Carnegie and Greensburg, Pa. This was a Touch-Tone telephone with 10 push buttons, manufactured by the Western Electric Manufacturing and supply Unit of the Bell System. The optional service was offered for an extra charge. Some previous marketing trials had taken place in Ohio and Pennsylvania. A 10 button dial was inserted into an adapter taking the place of the rotary dial. The use of 12 Button dials with * and # keys for special services came out rather quickly after the introduction of Touch Tone Service in 1963, and the 10 button dial was discontinued.

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