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MATH PUZZLE: Can you replace...

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

Correct answers: 144

The first user who solved this task is Nasrin 24 T.

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My wife texted me “I love u”.
I said that’s my favorite letter, too.

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Electron microscope

In 1940, the first U.S. electron misroscope was demonstrated in Philadelphia, Pennsylvania. It was able to produce a magnification of 100,000 times, in an apparatus 10 feet high and weighing half a ton. The inventor was Dr. Vladimir Zworykin at the RCA laboratories, Camden, New Jersey.

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