BRAIN TEASERS

# Find number abc

If bc6ba - 16117 = c2a7c find number abc. Multiple solutions may exist.
The first user who solved this task is Eugenio G. F. de Kereki.
#brainteasers #math

### There were these twin sisters...

There were these twin sisters just turning one hundred years old in St. Luke's Nursing Home and the editor of the Cambridge rag, "The Cambridge Distorter," told a photographer to get over thereand take the pictures of these 100 year old twin bitteys.
One of the twins was hard of hearing and the other could hear quite well.
The photographer asked them to sit on the sofa and the deaf one said to her twin, "WHAT DID HE SAY?"
He said, "WE GOTTA SIT OVER THERE ON THE SOFA!" said the other.
"Now get a little closer together," said the cameraman.
Again, "WHAT DID HE SAY?"
"HE SAYS SQUEEZE TOGETHER A LITTLE." So they wiggled up close to each other.
"Just hold on for a bit longer, I've got to focus a little," said the photographer.
Yet again, "WHAT DID HE SAY?"
"HE SAYS HE'S GONNA FOCUS!"
With a big grin the deaf twin shouted out, "OH MY GOD - BOTH OF US?"
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### John Michell

Died 21 Apr 1793 (born 1724). British geologist and astronomer who was first to devise a realistic estimate of the distance to the stars, discovered physical double stars, and is considered the father of seismology. After the Lisbon earthquake of 1755 (which killed 70,000 people), he suggested that earthquakes set up wave motion in the earth. He noted the increased frequency of earthquakes in volcanic areas. Michell realized that by comparing the time at which earthquakes are felt, the epicentre could be calculated. He invented a torsion balance, a device to measure very small forces, though died before carrying out its purpose to determine the density of the Earth. His rebuilt apparatus was used by Cavendish to make that measurement, which also gives the gravitational constant).«[Image: Michell torsion balance as used by Cavendish]
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