MATH PUZZLE: Can you replace...
[2833] MATH PUZZLE: Can you replace... - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 4212 - The first user who solved this task is Donya Sayah30
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MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 4212
The first user who solved this task is Donya Sayah30.
#brainteasers #math #riddles
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A couple is trying to have a b...

A couple is trying to have a baby. Finally, the blonde tells her husband, "Honey, I have great news! We're pregnant, and we're having twins!" The husband is overjoyed and says to his wife, "Honey that's wonderful, but how do you know so soon that we're having twins?" She nods her head and says, "Well, I bought the twin pack pregnancy test and they both came out positive!"
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Rail detector car

In 1928, a rail detector car was demonstrated near Poughkeepsie, N.Y. to representatives of the American Railway Association and of various railroads. Invented by Dr. Elmer Ambrose Sperry, it was designed to enable locating internal flaws in existing railroad tracks. This first car, car No. 101, was capable of travelling at 10 mph while examining one rail at a time. It had been previously field-tested 13 Jun 1928.
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