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Find number abc

If ac506 + 3c366 = 7ab7c find number abc. Multiple solutions may exist.

Correct answers: 2

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A three-year-old went with his...

A three-year-old went with his dad to see a litter of kittens. On returning home, he breathlessly informed his mother there were 2 boy kittens and 2 girl kittens.
"How did you know?" his mother asked.
"Daddy picked them up and looked underneath," he replied, "I think it's printed on the bottom."

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Earmuffs

In 1877, the first U.S. patent for earmuffs was issued to teen-aged Chester Greenwood of Farmington, Maine (No. 188,292). While trying out a new pair of ice-skates one winter, he experienced stinging ears, and solved his problem with beaver fur pads on a wire frame. By his mid-twenties, he had a factory and 11 workers producing in his hometown of Farmington producing 50,000 earmuffs yearly. His distribution grew to 400,000 pairs in 1936, the year he died. He patented many other inventions. In 1977, Maine's legislature declared 21 Dec, the first day of winter, as the annual Chester Greenwood Day. His hometown celebrates with a parade in early December, although the Greenwood Ear Protector factory is now a laundry.«

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