Calculate the number 213
[6537] Calculate the number 213 - NUMBERMANIA: Calculate the number 213 using numbers [1, 4, 2, 1, 20, 140] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 14 - The first user who solved this task is Nílton Corrêa de Sousa
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Calculate the number 213

NUMBERMANIA: Calculate the number 213 using numbers [1, 4, 2, 1, 20, 140] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 14
The first user who solved this task is Nílton Corrêa de Sousa.
#brainteasers #math #numbermania
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Blind Man

Husband and wife are waiting at the bus stop with their nine children. A blind man joins them after a few minutes. When the bus arrives, they find it overloaded and only the wife and the nine kids are able to fit onto the bus.
So the husband and the blind man decide to walk. After a while, the husband gets irritated by the ticking of the stick of the blind man as he taps it on the sidewalk, and says to him, "Why don't you put a piece of rubber at the end of your stick? That ticking sound is driving me crazy."
The blind man replies, "If you would've put a rubber at the end of YOUR stick, we'd be riding the bus ... so shut up."  

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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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