BRAIN TEASERS

# Find number abc

If b60c3 + 8ab58 = c8a5b find number abc. Multiple solutions may exist.
The first user who solved this task is Rutu Raj.
#brainteasers #math

### A man and his wife received a...

A man and his wife received a letter from their daughter who went to study overseas:
My beloved Parents, I miss you so much. I don’t know when I’m coming home, but it seems not anytime soon. It breaks my heart to think that by the time I get back you’ll be too old. So enclosed you will find a bottle of a potion I have invented. It will make you young, so when I return you’ll be the same age as I left you.
NOTE: “Please take only one drop”
So they opened the envelope and in it there is a bottle with a red potion. The husband looks at the wife and says: “You go first.”
So the wife opens the bottle and takes a drop, there after the husband follows. Indeed they do turn 5 years younger.
Years later the daughter returns home to find her mother young and beautiful, carrying a baby on her back.
The mother proceeds to tell her daughter how the potion worked and made her look young.
“Your father? Hmmm, my child, your father was so jealous that I was young and beautiful so he drank the whole bottle.”
“So where is he?”
“Oh, that’s him I have on my back."
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### Screw machine

In 1798, the first U.S. patent for a nut and bolt machine was issued to inventor David Wilkinson of Rhode Island. His machine for cutting screw threads incorporated a slide-rest, with a heavy carriage supported on three rollers Afterwards, his machine was operated by water power at Pawtucket Falls, RI. Wilson was a machinist who also produced iron forgings and castings for the cotton industry industry there, such as Slater's Mill. Wilkinson later produced a large general purpose lathe (1806), a pioneering advance that founded the American machine tool industry. [The first machine of importance for trimming the heads of nuts and bolts was invented later by Micah Rugg, who was issued U.S. patent No. 2,766 on 31 Aug 1842.]«
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