Which number should replace the question mark?

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[31] Which number should replace the question mark? - Which number should replace the question mark? - #brainteasers #math #riddles - Correct Answers: 43 - The first user who solved this task is Sanja Šabović

2013-09-22

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Which number should replace the question mark?

Correct answers: 43

The first user who solved this task is Sanja Šabović.

#brainteasers #math #riddles

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Sex Researcher

This sex researcher phones one of the participants in a recent survey of his to check on a discrepancy. He asks the bloke, "In response to the question on frequency of intercourse you answered 'twice weekly'. Your wife, on the other hand, answered 'several times a night'."
"That's right," replies the bloke, "And that's how it's going to stay until our second mortgage is paid off."

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Johann Friedrich Pfaff

Died 21 Apr 1825 at age 59 (born 22 Dec 1765).German mathematician who proposed the first general method of integrating partial differential equations of the first order. Pfaff did important work on special functions and the theory of series. He developed Taylor's Theorem using the form with remainder as given by Lagrange. In 1810 he contributed to the solution of a problem due to Gauss concerning the ellipse of greatest area which could be drawn inside a given quadrilateral. His most important work on Pfaffian forms was published in 1815 when he was nearly 50, but its importance was not recognised until 1827 when Jacobi published a paper on Pfaff's method.«

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