What is the missing number?
[4971] What is the missing number? - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 61 - The first user who solved this task is Djordje Timotijevic
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What is the missing number?

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 61
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math #riddles
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An elderly couple visits their grown-up grandson one night. While in the bathroom, Grandpa discovers a bottle of Viagra in his grandson's medicine cupboard.

"I don't think you should take one of those," says the grandson when his grandpa asks him about them: "They're pretty expensive."

"How much?" asks the old timer.

"$20 a pill," replies the grandson.

"I'd still like to try one," says the old man: "Before we go in the morning I'll leave the money under the pillow in the guest room."

The next day the grandson goes into the guest room, and lifts the pillow to find $120. Puzzled, he calls his grandpa. "Grandpa, I told you the pills were $20 each!" he says.

"I know," says the old man: "The extra $100 is from your grandma!"

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Johannes Diederik van der Waals

Died 9 Mar 1923 at age 85 (born 23 Nov 1837).Dutch physicist who was awarded the 1910 Nobel Prize for Physics for his research on the gaseous and liquid states of matter. He was largely self-taught in science and he originally worked as a school teacher. His main work was to develop an equation (the van der Waals equation) that—unlike the laws of Charles Boyle and Jacques Charles—applied to real gases. Since the molecules do have attractive forces and volume (however small), van der Waals introduced into the theory two further constants to take these properties into account. The weak electrostatic attractive forces between molecules and between atoms are called van der Waals forces in his honour. His valuable results enabled James Dewar and Heike Kamerlingh-Onnes to work out methods of liquefying the permanent gases.[Note: Alphabetizing under rules for Dutch names, usage is "Waals, Johannes van der". Notice use of lower case for "van der". Contrast German names like "Von Braun, Werner".]
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