Find number abc
[3204] Find number abc - If 73cc1 - a18cc = 115b7 find number abc. Multiple solutions may exist. - #brainteasers #math - Correct Answers: 67 - The first user who solved this task is Djordje Timotijevic
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Find number abc

If 73cc1 - a18cc = 115b7 find number abc. Multiple solutions may exist.
Correct answers: 67
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math
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Broke student

A college freshman called up his mother and asked her for some money, because he was broke. His mother said,

"Sure, sweetie. I will send you some money. You also left your

calculus book here when you visited 2 weeks ago.

Do you want me to send that up too?"

"Uhh, oh yeah, O.K." responded the student.

So his mom wrapped up the book and mailed it. Dad asked,

"Well how much did you give him?"

"Oh, I wrote 2 checks, one for $20, and the other for $500."

"That's $520!" said dad, "Are you crazy?"

"Don't worry honey," mom said. "I taped the $20 check to the

cover of his book, but I put the $500 one somewhere in ...

chapter 19!

Found on https://vk.com/notes15935520, posted by Liana Parhanita, on 4 Mar 2010

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Oldest fossils

In 1977, American paleontologist Elso S. Barghoorn of Harvard announced the discovery of Pre-Cambian spherical one-celled algae microfossils (named Eobacterium) 3.4 billion years old, earth's earliest life forms. Barghoorn, with J. William Schopf, studied the ancient chert (a flintlike or quartz-like rock) of the Fig Tree formation in Transvaal, South Africa. Rubidium and strontium ratios in the chert are used to establish the age of the rock, and the fossils contained in it. The fossils are a kind of Prokaryotes, organisms with simple cell wall containing organic chemicals, and examples of cell division are visibile in the remains. A huge number of varieties exist today. They all produce oxygen; and, in the Precambrian period, began to change the earth's primoidal reducing atmosphere to the oxygenated one we have today.
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