Which number should replace the question mark?
[31] Which number should replace the question mark? - Which number should replace the question mark? - #brainteasers #math #riddles - Correct Answers: 51 - The first user who solved this task is Sanja Šabović
10
61
8.03
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Which number should replace the question mark?

Which number should replace the question mark?
Correct answers: 51
The first user who solved this task is Sanja Šabović.
#brainteasers #math #riddles
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Animal Lives

Q: What has more lives than a cat?
A: A frog -- it croaks every night.
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Electric mine

In 1841, an underwater torpedo operated by electric current was described by its inventor, Samuel Colt of Hartford, Conn., in a letter to U.S. President John Tyler. The invention was a combination of Robert Fulton's stationary torpedo and Prof. Robert Hare's galvanic current. Colt proved his mines could sink ships with a demonstration on 4 Jul 1842 sinking the gunboat Boxer in New York Harbor, and another on the following 18 Oct which sank the 300-ton brig Volta. By 13 Apr 1843, He was called upon to demonstrate to the President and his Cabinet, and Colt blew up a schooner on the Potomac River by an electric main from a distance of five miles.
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