Find a missing number
[876] Find a missing number - Author: Lidija Duvnjak - #brainteasers #math - Correct Answers: 30 - The first user who solved this task is Slobodan Strelac
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Find a missing number

Author: Lidija Duvnjak
Correct answers: 30
The first user who solved this task is Slobodan Strelac.
#brainteasers #math
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There Are No Dogs Allowed Here


A man goes to a bar with his dog. He goes up to the bar and asks for a drink. The bartender says "You can't bring that dog in here!" The guy, without missing a beat, says "This is my seeing-eye dog." "Oh man, " the bartender says, "I'm sorry, here, the first one's on me." The man takes his drink and goes to a table near the door.
Another guy walks in the bar with a Chihuahua. The first guys sees him, stops him and says "You can't bring that dog in here unless you tell him it's a seeing-eye dog." The second man graciously thanks the first man and continues to the bar. He asks for a drink. The bartender says "Hey, you can't bring that dog in here!"
The second man replies "This is my seeing-eye dog." The bartender says, "No, I don't think so. They do not have Chiwauas as seeing-eye dogs." The man pauses for a half-second and replies "What?!?! They gave me a Chihuahua?!?"
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Gallium

In 1875, the element gallium was discovered by P.E. Lecoq de Boisbaudran. In an article in the Annales de Chimie in 1877, he said his search started 15 years earlier, but with inadequate resources. Even with a new laboratory (1863) he had no success until he realized he was using too little material, and in Feb 1874 started with 52 kg of a mineral from Pierrefitte mine. He finally isolated a tiny sample: “On August 27, 1875, between three and four at night, I perceived the first indications of the existence of a new element that I named gallium in honor of France (Gallia).”His first spectroscopic analysis of the tiny amount (he estimated 1/100 mg) of the prepared sample showed a previously unknown violet line at 417.0 indicating a new element.
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