Replace the question mark with a number
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 451
The first user who solved this task is Sanja Šabović.
#brainteasers #math #riddles
Water bicycleIn 1869, the first U.S. patent for a "water velocipede" was granted to F.A. Spofford and Matthew G. Raffington of Columbus, Ohio (No. 95,531). A number of similar devices were patented by the end of the nineteenth century. |