Calculate 4+20
[2395] Calculate 4+20 - If 1+5=18, 2+10=36, 3+15=54 then, 4+20=? - #brainteasers #math #riddles - Correct Answers: 265 - The first user who solved this task is Roxana zavari
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Calculate 4+20

If 1+5=18, 2+10=36, 3+15=54 then, 4+20=?
Correct answers: 265
The first user who solved this task is Roxana zavari.
#brainteasers #math #riddles
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Vacuum Cleaner Salesman

A little old lady answered a knock on the door one day, only to be confronted by a well-dressed young man carrying a vacuum cleaner. Good morning," said the young man. "If I could take a couple of minutes of your time, I would like to demonstrate the very latest in high-powered vacuum cleaners.
"Go away!" said the old lady. "I haven't got any money!" and she proceeded to close the door..
Quick as a flash, the young man wedged his foot in the door and pushed it wide open. "Don't be too hasty!" he said. "Not until you have at least seen my demonstration." And with that, he emptied a bucket of horse manure onto her hallway carpet. "If this vacuum cleaner does not remove all traces of this horse manure from your carpet, Madam, I will personally eat the remainder."
The old lady stepped back and said, "Well I hope you've got a damned good appetite, because they cut off my electricity this morning.."    

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Atomic nucleus recoil

In 1904, a letter in the journal Nature*, Harriet Brooks pointed out a peculiar type of volatility shown by an active deposit of radium immediately after its removal from the emanation. Hahn and Russ and Markower later showed (1909) that “the effect was due to the recoil of radium B from the active surface accompanying the expulsion of an alpha-particle from Radium A. This method of the separation of the elements by recoils ultimately proved of much importance in disentangling the complicated series of changes in the radioactive bodies,”according to Ernest Rutherford (1933). Thus, Harriet Brooks was probably the first person to observe the recoil of the atomic nucleus as nuclear particles were emitted during radioactive decay.(*vol. 70, p. 270)
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