BRAIN TEASERS

# Find number abc

If b8b67 - 3a0c0 = 2abb7 find number abc. Multiple solutions may exist.
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math

### Childhood Sweethearts

An elderly couple who were childhood sweethearts had married & settled down in their old neighborhood.
To celebrate their 50th wedding anniversary they walk down to their old school. There, they hold hands as they find the desk they shared & where he had carved "I love you, Sally".
On their way back home, a bag of money falls out of an armoured car practically at their feet. She quickly picks it up, & they don't know what to do with it so they take it home. There, she counts the money, & its fifty-thousand dollars.
The husband says: "We've got to give it back".
She says, "Finders keepers" & puts the money back in the bag & hides it up in their attic.
The next day, two policemen are going from door-to-door in the neighbourhood looking for the money show up at their home.
One knocks on the door & says: "Pardon me, but did either of you find any money that fell out of an armoured car yesterday?"
She says: "No"..
The husband says: "She's lying. She hid it up in the attic."
She says: "Don't believe him, he's getting senile."

But the policemen sit the man down & begin to question him.
One says: "Tell us the story from the beginning."
The old man says: "Well, when Sally & I were walking home from school yesterday ..."
At this, the policeman looks at his partner & says: "We're outta here ..."

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### First xenon compound

In 1962, the first compound of any “inert gas” was made by Neil Barlett by reacting platinum hexafluorideand xenon to form XePtF6, a yellow-orange solid that was stable at room temperature. The previous autumn, he had prepared a remarkable compound of oxygen with platinum hexafluoride. In that compound, [O2]+[PtF6]–, the platinum hexafluoride, PtF6 was such an extreme oxidizer that the oxygen formed a positive cation. Interestingly, the energy to remove an electron from oxygen (12.2 eV), he realized, was extremely close to that for xenon (12.13 eV). This suggested a xenon compound could be made in a similar way. His success ended the half-century belief that xenon was an inert gas, and is since known as a “noble” gas.«
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