BRAIN TEASERS

# Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?
The first user who solved this task is Donya Sayah30.
#brainteasers #math #riddles

### Sick Duck

A man took his old duck to the Doctor, concerned because the duck wouldn't eat.
The Doctor explained to the man that as ducks age their upper bills grow down over their lower bills and make it difficult for the animal to pick up it's food.
"What you need to do is gently file the upper bill down even with the lower bill. But you must be extra careful because the duck's nostrils are located in the upper bill and if you file down too far, when the duck takes a drink of water it'll drown."
The man goes about his business and about a week later the Doctor runs into his patient.
"Well, how is that duck of yours?" the Doctor inquires.
"He's dead." declared the heartbroken man.
"I told you not to file his upper bill down too far! He took a drink of water and drowned didn't he?" insisted the Doctor.
"No." lamented the man. "I think he was dead before I took him out of the vise."

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### Paul Niggli

Born 26 Jun 1888; died 13 Jan 1953 at age 64.Swiss mineralogist who originated the idea of a systematic deduction of the patterns in the internal structure of crystals by means of X-ray data. He supplied a complete outline of methods that have since been used to determine these patterns. There are 230 possible different internal patterns for different crystals. Because the patterns describe a three-dimensional arrangement, they are known as space groups. Niggli also developed a notation that described the individual space groups, and co-authored a definitive set of tables describing them.
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