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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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Arnold Neustadter

Died 17 Apr 1996 at age 85 (born 25 Aug 1910).American inventor of the Rolodex, an alphabetized rotating card file with a ball-bearing clutch. He invented the device in the 1940s with the help of an engineer who developed the cylindrical housing. Neustadter specialized in office technology, also inventing the Swivodex, spill-proof inkwell and the Clipodex, a knee-top dictation tool.

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