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Find number abc

If ac40c + a24a0 = 18b8ac find number abc. Multiple solutions may exist.

Correct answers: 3

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Hindu Happy Birthday

Q: What does a Hindu wish someone on their birthday?
A: May you have many happy returns.

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Leather tanning

In 1884, the first U.S. patents for tanning hides and skins through the action of a metallic salt were issued to Augustus Schultz of New York City. His invention of a chrome tanning process enabled leather to be tanned thinner and stronger than by vegetable tanning. (Nos. 291,784 and -5)

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