Which number should replace the question mark?
FUNNY MATH: Which number should replace the question mark?Correct answers: 37
The first user who solved this task is Sanja Šabović.
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Gas MaskIn 1849, the forerunner of modern gas masks is patented by Lewis Phectic Haslett of Louisville, Ky. His "inhaler or lung protector" design used woolen fabric (or other porous material) to filter dust and other material from the air (U.S. No. 6,529). |