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Replace the question mark with a number

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

Correct answers: 683

The first user who solved this task is Snezana Milanovic.

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Second-hand goods

A divorced man bumps into his ex-wife's new husband at a party.

After knocking back a few drinks, he walks over to the guy and sneers: "So, how do you like using second-hand goods?"

"Doesn't bother me," the new husband replies. "Once you get past the first three inches, it's all brand new."

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First privately-built satellite

In 1961, the first satellite built by private citizens was put in to orbit. A Thor-Agena rocket, launched to deploy a militaryDiscoverer-36 satellite, also carried the 10-lb OSCAR I . The Orbiting Satellite Carrying Amateur Radio was deployed in low orbit, just above Earth's atmosphere, and it began transmitting "HI" in Morse code,10 times a minute. It was the 60th anniversary of Marconi's first transatlantic radio transmission, and little more than four years since Russia launched Sputnik on 4 Oct 1957. OSCAR 1 was designed and hand-built for $63 by California radio amateurs. The battery powered a 140-mW transmitter on 144.983 MHz, transmitting HI in Morse code for 22 days, for 312 orbits until 1 Jan 1962 when its non-rechargeable battery failed. It burned up in the atmosphere on 31 Jan 1962.«

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