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MATH PUZZLE: Can you replace...

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

Correct answers: 884

The first user who solved this task is Snezana Milanovic.

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If you want to know who is rea...

If you want to know who is really man’s best friend, put your dog and your wife in the trunk of your car, come back an hour later, open the trunk, and see which one is happy to see you.

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Refrigerator

In 1926, the first U.S. patent for a household refrigerator, operating on gas, was issued to The Electrolux Servel Corporation. The gas-heat driven absorption refrigerator was invented by Swedish engineering students Carl G. Munters and Baltzar von Platen. The new concept avoided the use of toxic gases such as sulphur dioxide, methyl chloride, and ammonia gases, used in earlier mechanical compressor home refrigerators since 1918. The new Electrolux-Servel refrigerator entered the US market in 1926, and after 1927 became the sole gas refrigerator on the US market until the 1950s. A tiny gas flame and a tiny flow of water in the refrigerator took the place of all moving parts, circulating a liquid refrigerant which was hermetically sealed in rigid steel.

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