What is the missing number?
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 45
The first user who solved this task is Thinh Ddh.
#brainteasers #math #riddles
Typesetting machineIn 1857, a U.S. patent was issued for the design of a typesetting machine invented by Timothy Alden of New York (No. 18,175). This is the first such machine that actually operated. The type was arranged in cells around the circumference of a horizontal wheel. As the wheel revolved, several receivers also started to rotate. The desired type was picked up and dropped in proper order in a line. |