BRAIN TEASERS

# Calculate the number 3909

NUMBERMANIA: Calculate the number 3909 using numbers [1, 3, 5, 6, 12, 273] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
The first user who solved this task is Manguexa Wagle.
#brainteasers #math #numbermania

### A man goes into a pet shop and...

A man goes into a pet shop and tells the owner that he wants to buy a pet that can do everything. The shop owner suggests a faithful dog.
The man replies, "Come on, a dog?"
The owner says, "How about a cat?"
The man replies, "No way! A cat certainly can't do everything. I want a pet that can do everything!"
The shop owner thinks for a minute, then says, "I've got it! A centipede!"
The man says, "A centipede? I can't imagine a centipede doing everything, but okay... I'll try a centipede."
He gets the centipede home and says to the centipede, "Clean the kitchen."
Thirty minutes later, he walks into the kitchen and... it's immaculate! All the dishes and silverware have been washed, dried, and put away; the counter-tops cleaned; the appliances sparkling; the floor waxed. He's absolutely amazed.
He says to the centipede, "Go clean the living room."
Twenty minutes later, he walks into the living room. The carpet has been vacuumed; the furniture cleaned and dusted; the pillows on the sofa plumped; plants watered. The man thinks to himself, "This is the most amazing thing I've ever seen. This really is a pet that can do everything!"
Next he says to the centipede, "Run down to the corner and get me a newspaper."
The centipede walks out the door. 10 minutes later...no centipede. 20 minutes later... no centipede. 30 minutes later...no centipede. By this point the man is wondering what's going on. So he goes to the front door, opens it... and there's the centipede sitting right outside.
The man says, "Hey!! I sent you down to the corner store 45 minutes ago to get me a newspaper. What's the matter?!"
The centipede says, "I'm goin'! I'm goin'! I'm just putting on my shoes!"
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### Tom Kilburn

Born 11 Aug 1921; died 17 Jan 2001 at age 79.British electrical engineer who wrote the computer program used to test the first stored-program computer, the Small-Scale Experimental Machine, SSEM, also known as "The Baby." First tested on 21 Jun 1948, the program took 52 minutes to run. The tiny experimental computer had no keyboard or printer, but it successfully tested a memory system developed at Manchester University in England. This system, based on a cathode-ray tube, was the first that could store programs, whereas previous electronic computers had to be rewired to execute each new problem.
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