MATH PUZZLE: Can you replace...
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 2986
The first user who solved this task is Дејан Шкребић.
#brainteasers #math #riddles
Paper pencilIn 1895, the first U.S. patent for a paper pencil was issued to Fredrick E. Blaisdell of Philadelphia, Pa. His patent No. 549,952 was accompanied by No. 550,212 on the same date on a machine for manufacturing pencils. |