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# Find number abc

If 431ac - 1ba58 = ab8ba find number abc. Multiple solutions may exist.
The first user who solved this task is Nílton Corrêa De Sousa.
#brainteasers #math

### Lightbulb Joke Collection 12

Q: How many journalists does it take to screw in a lightbulb?
A: Three. One to report it as an inspired government program to bring light to the people, one to report it as a diabolical government plot to deprive the poor of darkness, and one to win a pulitzer prize for reporting that Electric Company hired a lightbulb assassin to break the bulb in the first place.
Q: How many computer journalists does it take to screw in a light bulb?
A: Five-one to write a review of all the existing light bulbs so you can decide which one to buy, another one to write a remarkably similar one in another magazine the next month, a third to have a big one come out on glossy paper two months later that is by then completely out of date, a fourth to hint in his/her column that a completely new and updated bulb is coming out, and the fifth to report a rumor that that new bulb is shipping with a virus.
Q: How many GLC workers does it take to change a lightbulb ?
A: Four. One to do it and three to go round putting up posters announcing that the GLC, working for London, is going to change the lightbulb.
Q: How many city planners does it take to screw in a light bulb?
A: Six - four to write an extensive study recommending a three-way 100/200/250 watt light bulb, one to write an article in the newspaper praising the study, and one to put in a 10 watt blub instead.
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### Alexander Alexandrovich Friedmann

Born 16 Jun 1888; died 16 Sep 1925 at age 37.Russian mathematician who was the first to work out a mathematical analysis of an expanding universe consistent with general relativity, yet without Einstein's cosmological constant. In 1922, he developed solutions to the field equations, one of which clearly described a universe that began from a point singularity, and expanded thereafter. In his article On the Curvature of Space received by the journal Zeitschrift für Physik on 29 Jun 1922, he showed that the radius of curvature of the universe can be either an increasing or a periodic function of time. In Jul 1925, he made a record-breaking 7400-m balloon ascent to make meteorological and medical observations. A few weeks later he fell ill and died of typhus.[Also spelled Aleksandr Aleksandrovich. Last name also seen as Friedman. For date of birth, see MacTutor for explanation of why 17 Jun or 29 Jun birthdate seen in various sources is due to a confusion between New Syle and Old Style dates. Birth date is 29 Jun 1888 Old Style.]
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