Which number should replace the question mark?
[745] Which number should replace the question mark? - Which number should replace the question mark? Author: Sumbul Azeem - #brainteasers #math #riddles - Correct Answers: 335 - The first user who solved this task is Eric Newton
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Which number should replace the question mark?

Which number should replace the question mark? Author: Sumbul Azeem
Correct answers: 335
The first user who solved this task is Eric Newton.
#brainteasers #math #riddles
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The Sentence

A schoolteacher asked her primary six class to construct sentences with the words: defeat, detail, defense.

There was a pause before a pupil raised his hand and said he could make a sentence with them; "The cow jumped over defense and detail went over defeat."
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Magnetising metals

In 1744, Gowan Knight presented his research on magnetising metals to the Royal Society. The method he discovered for permanently magnetising hard steels. The use of steel instead of soft iron greatly improved the otherwise crude compass needles used by England's Royal Navy, which then had a much longer magnetized life. Knight took out a patent for his compass in 1766. He devised better ways to suspend compass needles, and introduced the rhomboid shape now common for compass needles.Reference: Philosophical Trans., No. 474, p. 161
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