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Find number abc

If 5a7c0 - 16bc0 = a6c00 find number abc. Multiple solutions may exist.

Correct answers: 26

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

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World Book and Copyright Day Joke

April 23rd is World Book and Copyright Day! Find a joke about it!

A man walks into a library and asks the librarian, "Do you have any books on how to create suspense?"
The librarian pauses for a moment, then says, "Yes, but I'm not going to tell you where they are!"

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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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