BRAIN TEASERS

# Find number abc

If 7224b - c218c = 2aab1 find number abc. Multiple solutions may exist.
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math

### Quitting Drugs

Two young guys were picked up by the cops for smoking dope and appeared in court on Friday before the judge. The judge said, "You seem like nice young men, and I'd like to give you a second chance rather than jail time. I want you to go out this weekend and try to show others the evils of drug use and get them to give up drugs forever. I'll see you back in court Monday."
Monday, the two guys were in court, and the judge said to the 1st one, "How did you do over the weekend?" "Well, your honor, I persuaded 17 people to give up drugs forever." "17 people? That's wonderful. What did you tell them?" "I used a diagram, your honor. I drew two circles like this...
o O
...and told them this (the big circle) is your brain before drugs and this (small circle) is your brain after drugs." "That's admirable," said the judge.
"And you, how did you do?", he asked the second boy, "Well, your honor, I persuaded 156 people to give up drugs forever." "156 people! That's amazing! How did you manage to do that?!?", "Well, I used a similar approach. (draws two circles)
O o

I said (pointing to the small circle) "this is your asshole before prison, ..."

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## Brain Teasers

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### Chester F. Carlson

Died 19 Sep 1968 at age 62 (born 8 Feb 1906). Chester Floyd Carlson was an American physicist who invented xerography (22 Oct 1938), an electrostatic dry-copying process that found applications ranging from office copying to reproducing out-of-print books. The process involved sensitizing a photoconductive surface to light by giving it an electrostatic charge Carlson developed it between 1934 and 1938, and initially described it as electrophotography It was immediately protected by Carlson with an impenetrable web of patents, though it was not until 1944 that he was able to obtain funding for further development. In 1947 he sold the commercial rights for his invention to the Haloid Company, a small manufacturer of photographic paper (which later became the Xerox Corporation).
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