Replace the question mark with a number
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 157
The first user who solved this task is H Tav.
#brainteasers #math #riddles
Edison patentsIn 1881, six patents were issued to Thomas A. Edison for electrical inventions, U.S. Nos. 242,896 to 242,901. They were for, respectively, two concerning an "Incandescent Electric Lamp," an "Incandescent Electric Lamp," a "Magneto or Dynamo Electric Machine," about "Electric Lighting," about "Manufacturing Carbons for Electric Lamps" and an "Electric Meter." |