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Fazil Hashim

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3. Mita Kojd 4525
4. Alfa Omega 4378
5. Fazil Hashim 4337
6. Jakubovski Vladimir 4216
7. Chandu Rajyaguru 4173
last 3 solved tasks
If 6c6a8 - b4393 = cba3c find number abc. Multiple solutions may exist.
When I'm first said, I'm quite mysterious, But when I'm explained, I'm nothing serious. What am I?
What is the missing number?

Sir Arthur Percy Morris Fleming

Born 16 Jan 1881; died 14 Sep 1960 at age 79.English engineer who was a major figure in developing techniques for manufacturing radar components. During WW I, Fleming made important advances in submarine-detection gear. In 1920, as a pioneer in the development of radio, he established in Manchester the second British transmitting station to broadcast programs on a daily basis. His work on demountable, high-power thermionic tubes made it possible to establish radar stations in Great Britain by the time WW II began in 1939.

Ballpen in space

When NASA first started sending up astronauts, they quickly discovered that ballpoint pens would not work in zero gravity.
To combat the problem, NASA scientists spent a decade and $12 billion to develop a pen that writes in zero gravity, upside down, underwater, on almost any surface including glass and at temperatures ranging from below freezing to 300 C.
The Russians used a pencil.

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