BRAIN TEASERS

# Calculate the number 1070

NUMBERMANIA: Calculate the number 1070 using numbers [1, 4, 5, 3, 85, 981] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
The first user who solved this task is Sanja Šabović.
#brainteasers #math #numbermania

### The runner

Mary was having an affair during the day while her husband was at work. One day, she was in bed with her boyfriend Ralph, when she heard her husband's car pull in the driveway. She yelled at Ralph, "Hurry! grab your clothes and jump out the window, my husband is home early!"

Ralph looked out the window and said, "I can't jump out the window! It's raining like hell out there."

Mary cried, "If my husband catches us in here, he will kill both of us!"

So, Ralph grabbed his clothes and jumped out the window. When he landed outside he found himself in the middle of a marathon race, so he started running along side the others, only he was still in the nude, carrying his clothes on his arm.

One of the runners asked him, "Do you always run in the nude?"

Ralph answered, while gasping for air, "Oh yes, it feels so free having the air blow over your skin while you are running."

Ralph answered breathlessly, "Oh yes, that way I can get dressed at the end of the run and get in my car to go home."

Then another runner asked, "Do you always wear a condom when you run?"

Ralph answered, "Only if it's raining."

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### Atomic chain reaction

In 1942, the first self-sustained nuclear chain reaction was demonstrated in Chicago, Illinois. At the University of Chicago, Enrico Fermi and his team achieved the world's first artificial nuclear chain reaction, in a makeshift lab underneath the University's football stands at Stagg Field. Work on the experimental pile had begun on 16 Nov 1942. It was a prodigious effort. Physicists and staffers, working around the clock, built a lattice of 57 layers of uranium metal and uranium oxide embedded in graphite blocks. A wooden structure supported the graphite pile. The chain reaction was part of the Manhattan Project, a secret wartime project to develop nuclear weapons, which initiated the modern nuclear age. This was a discovery that changed the world.
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