Replace the question mark with a number
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 419
The first user who solved this task is Fazil Hashim.
#brainteasers #math #riddles
Electric stoveIn 1896, the first U.S. patent for an electric stove was patented by William.S. Hadaway, Jr., in New York City. (No. 563,032). It provided a uniform surface distribution of heat from a one-ring spiral coiled conductor. An earlier apparatus, described as an "electrical heating apparatus," which the inventor termed an "electroheater," was patented by George B. Simpson of Washington, D.C. on 20 Sep 1859 (No. 25,532). Simpson's device utilized the heating effect resulting from passing electric current through coils of wire made from platina or other metals.* |