Find number abc
[6276] Find number abc - If a99bb - 18717 = 5118c find number abc. Multiple solutions may exist. - #brainteasers #math - Correct Answers: 30 - The first user who solved this task is Nílton Corrêa de Sousa
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Find number abc

If a99bb - 18717 = 5118c find number abc. Multiple solutions may exist.
Correct answers: 30
The first user who solved this task is Nílton Corrêa de Sousa.
#brainteasers #math
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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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Fire extinguisher

In 1872, a fire extinguisher was patented by its black American inventor, Thomas J. Martin of Dowagiac, Michigan (U.S. No. 125,063). The patent describes installing piping and pumps in dwellings, mills, factories, or cities. The pipes may also be used for warming, ventilating and washing buildings, and for washing pavements and sprinkling streets. The discharge nozzles are designed to be mounted on vertical pipes, and have globe valves seated in them, all enclosed in a cage. The cage is made sufficiently high to allow the rise of the globe valve when pressed up by a jet of water through the nozzle. In use, the water jet would spread by the concave underside of the globe to spray an annular sheet or spray and wet a large surface.[Image: detail of discharge nozzle. Click image for full patent drawing]
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