Find number abc
If 5a7c0 - 16bc0 = a6c00 find number abc. Multiple solutions may exist.Correct answers: 26
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Adding machineIn 1872, the first U.S. patent for an adding machine capable of printing totals and subtotals, called a "calculating machine," was issued to E.D. Barbour of Boston, Mass. However, it was not practical. (No. 133,188) |