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MATH PUZZLE: Can you replace...

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

Correct answers: 288

The first user who solved this task is Erkain Mahajanian.

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A visitor to a college campus

A visitor to a college campus paused to admire the new Hemingway Hall. "It's a pleasure to see a building named for Ernest Hemingway."
"Actually," said the guide, "it's named for Joshua Hemingway. No relation."
"Oh? Was Joshua Hemingway a writer also?"
"Yes, indeed. He wrote a check."

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Moon radar

In 1946, the U.S. Army Project Diana team detected radar signals reflected off the moon's surface. A 180 cycle wave pulse with a 1/4 sec duration was beamed by the Army Signal Corps from the Evans Signal Laboratories, Belmar, N.J. The echo was received 2.4 sec. later, proving that radio waves could penetrate Earth's atmosphere. The experiment was supervised by Lt. Col. John H. De Witt, the broadcasting pioneer and amateur astronomer who first came up with the idea in 1940. His early amateur attempts were unsuccessful, but his chance came a few years later, after WW II, courtesy of the U.S. Army, at the Signal Corps Laboratories. During the war, he had developed radar for locating mortars and directing counterfire.«[Image: A wartime SCR-271 bedspring radar antenna, greatly modified for use in the experiment.]

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