Find number abc
If 84b24 - 4a804 = c4820 find number abc. Multiple solutions may exist.Correct answers: 34
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ColorscopeIn 1930, the Colorscope was first publically demonstrated in New York City. It used a photocell that reacts to colours of light, and could match colours more exactly than the human eye. The tiny electrical current generated was sufficient to operate relays or meters. It was invented by Harold H. Sheldon and Dr. Walter A Schneider. |