Can you replace the question mark with a number?
[6511] Can you replace the question mark with a number? - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 78 - The first user who solved this task is Nílton Corrêa de Sousa
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Can you replace the question mark with a number?

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 78
The first user who solved this task is Nílton Corrêa de Sousa.
#brainteasers #math #riddles
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A devoted wife had spent her l...

A devoted wife had spent her lifetime taking care of her husband. Now he had been slipping in and out of a coma for several months, yet she stayed by his bedside every single day.
When he came to senses, he motioned for her to come near him.
As she sat by him, he said, "You know what? You have been with me all through the bad times. When I got fired, you were there to support me. When my business failed, you were there. When I got shot, you were by my side. When we lost the house, you gave me support. When my health started failing, you were still by my side. You know what?"
"What dear?" she asks gently.
"I think you bring me bad luck."
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Portrait camera

In 1841, Austrian inventor Friedrich Voigtländer began selling the world's first purpose-built portrait camera. Since a person wanting a portrait would have to hold a pose for the time required for a successful exposure, it was critically important to be able to do that in the shortest time—which depends on the lens. Voigtländer incorporated a rapid double-combination lens designed according to the calculations of Viennese mathematician Josef Max Petzval. What used to take 20-30 minutes could now be done in two. The brass-bodied camera was shaped somewhat like a Lava Lamp bottle on its side. It made circular daguerreotypes about 3½-in (9cm) diam. The Voigtländer family business was started by his father in Vienna in 1756, making scientific instruments.«
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