MATH PUZZLE: Can you replace...
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 60
The first user who solved this task is Alfa Omega.
#brainteasers #math #riddles
Black American patentIn 1874, a U.S. patent for a "Steam Lubricator" was issued to the prolific Black American inventor, Elijah J. McCoy (No. 146,697). |