MATH PUZZLE: Can you replace...
[3546] MATH PUZZLE: Can you replace... - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 351 - The first user who solved this task is Linda Tate Young
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MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 351
The first user who solved this task is Linda Tate Young.
#brainteasers #math #riddles
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At school, a boy is told by a...

At school, a boy is told by a classmate that most adults are hiding at least one dark secret, and that this makes it very easy to blackmail them by saying, "I know the whole truth" even when you don't know anything.
The boy decides to go home and try it out. As he is greeted by his mother at the front door he says, "I know the whole truth." His mother quickly hands him $20 and says, "Just don't tell your father."
Quite pleased, the boy waits for his father to get home from work, and greets him with, "I know the whole truth." The father promptly hands him $40 and says, "Please don't say a word to your mother."
Very pleased, the boy is on his way to school the next day, when he sees the mailman at his front door. The boy greets him by saying, "I know the whole truth."
The mailman drops the mail, opens his arms and says, "Then come give your FATHER a big hug!"
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Watermark patent

In 1819, a triple paper was patented in Britain by Sir William Congreve that could incorporate a colored watermark, visible when the paper was held up to the light, to make currency harder to counterfeit. His invention was to overlay a very thin couched sheet of white paper on each side of a layer of colored pulp containing a design, which would then be pressed together and dried. He made a proposal to the Commission of the Bank of England on 30 Oct 1818, but his process was not adopted due to resistance from the Portals firm which had manufactured the Bank of England's currency paper since 1725. Congreve is best known for his invention of military rockets, first used militarily, against the French, on 8 Oct 1806.«
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