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MATH PUZZLE: Can you replace...

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

Correct answers: 2987

The first user who solved this task is Дејан Шкребић.

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Couples Time

Why don't some couples go to the gym?
Because some relationships just don't work out.

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Radioisotopes exported

In 1947, radioactive isotopes produced from phosphorus-31, arrived at Canberra, Australia, being the first export of radioisotopes from the U.S. They were to be used in Australia's X-ray and medical laboratory. Oak Ridge National Laboratory in Oak Ridge, Tenn., produced the isotopes as a by-product of the chain reaction in a uranium pile. They travelled by airplane via San Francisco, California.

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