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Find number abc

If 26b9c + 58c5b = 8515a find number abc. Multiple solutions may exist.
The first user who solved this task is Nasrin 24 T.
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Parking the car....

Joe and Joan were sitting down to their usual morning cup of coffee listening to the weather report on the radio. "There will be 3 to 5 inches of snow today, and a snow emergency has been declared," the weather report said.

"You must park your cars on the odd numbered side of the streets."

Joe said, "Jeez, okay," and got up from his coffee.

The next day they were sitting down with their morning cups of coffee. The weather forecast was, "There will be 2 to 4 inches of snow today, and a snow emergency has been declared.

You must park your cars on the even numbered side of the streets." Again Joe replied, "Jeez, okay," and got up from his coffee.

Two days later, again they're sitting down with their cups of coffee and the weather forecast said, "There will be 6 to 8 inches of snow today, and a snow emergency has been declared. You must park your cars on the..." and the power went out and Joe didn't get the rest of the instructions.

He turned to Joan, "Jeez, what am I going to do now, Joan?"

Joan replied, "Aw, Joe, just leave the car in the darned garage today."

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U.S. geology book

In 1809, the first significant U.S. geology book was read by William Maclure before the American Philosophical Society at Philadelphia, Pa. HisObservations on the Geology of the United States, contained the first chart of United States territory that divided the land into rock types. Though crude, it was the first colored true geological map of the country and one of the world's earliest geological maps. It was published with revisions in 1817 that accepted basalt and granite to be rocks of volcanic origin (thus shrinking the concept of “Neptunian” rocks). Maclure was a wealthy businessman and amateur geologist who emigrated from Scotland and became a citizen in 1796. He is considered the first notable and influential American geologist.
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