Find number abc
[7136] Find number abc - If 7a7bc - abb70 = 791c find number abc. Multiple solutions may exist. - #brainteasers #math - Correct Answers: 20
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Find number abc

If 7a7bc - abb70 = 791c find number abc. Multiple solutions may exist.
Correct answers: 20
#brainteasers #math
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Dov Davidoff: Dressing Up Like a Referee

I like to dress up as a referee and walk into a Foot Locker. You gotta try this. It freaks them out. They get all insecure. The guys like, Wait a second, can I help you? I was like, Can I help you, man? I, too, am a referee. Maybe we could work it out together. And then someone will ask me for a size 10, and Ill be like, Do I look like I work here, chief?
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Achromatic lenses

In 1758, optician John Dolland, having created achromatic lenses, reported this to the Royal Society. Isaac Newton had described the blurring effect due to chromatic abberation, but could not solve the problem in simple lenses, which was important in the preparation of lenses for telescopes and microscopes. A concave face of a lens of flint glass (which has a greater color dispersion than crown glass) is cemented to a convex face of a crown glass lens. Thus the dispersion properties causing chromatic aberration are removed from both lenses simultaneously. Although Dollond patented the discovery of the achromatic lens in the mid-18th century, it is widely believed that he was not its inventor, but learned about it from lens maker George Bass.
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