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mahta majdi

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last 3 solved tasks
If cc48c - ca3bb = 8a23 find number abc. Multiple solutions may exist.
If 803bc - ac2ca = 3c1a1 find number abc. Multiple solutions may exist.
MATH PUZZLE: Can you replace the question mark with a number?

Georg von Peurbach

Died 8 Apr 1461 at age 37 (born 30 May 1423).Austrian mathematician and astronomer who promoted the use of Arabic numerals (introduced 250 years earlier in place of Roman numerals), especially in a table of sines he calculated with unprecedented accuracy. He died before this project was finished, and his pupil, Regiomontanus continued it until his own death. Peurbach was a follower of Ptolomy's astronomy. He insisted on the solid reality of the crystal spheres of the planets, going somewhat further than in Ptolomy's writings. He calculated tables of eclipses in Tabulae Ecclipsium, observed Halley's comet in Jun 1456 and the lunar eclipse of 3 Sep 1457 from a site near Vienna. Peurbach wrote on astronomy, his observations and devised astronomical instruments.[Image: from Epitome of the Almagest.]

Boarding From What Gate?

At the airport for a business trip, I settled down to wait for the boarding announcement at Gate 35. Then I heard the voice on the public address system saying, "We apologize for the inconvenience, but Delta Flight 570 will board from Gate 41."
So my family picked up our luggage and carried it over to Gate 41. Not ten minutes later the public address voice told us that Flight 570 would in fact be boarding from Gate 35.
So, again, we gathered our carry-on luggage and returned to the original gate. Just as we were settling down, the public address voice spoke again: "Thank you for participating in Delta's physical fitness program.
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