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MATH PUZZLE: Can you replace...

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

Correct answers: 135

The first user who solved this task is Thinh Ddh.

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Mobile betatron

In 1948, the first mobile betatron began operation at the U.S. Naval Ordnance Laboratory, White Oak, Maryland. The betatron acclerated electrons using 10 million volts to produce a sharp beam of high-energy X-rays capable of penetrating 16 inches of steel. It was built by General Electric Company of Schenectady, N.Y.

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