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MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 280

The first user who solved this task is Djordje Timotijevic.

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Why Jesus Was Jewish

Of course Jesus was Jewish. He was 30-years-old, lived with his parents, worked in the family business, and his mom thought he was God's gift to earth.

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Singer's treadle sewing machine

In 1851, Isaac M. Singer of New York City was granted a patent for the first sewing machine with a rocking treadle. Although a sewing machine had already been patented, Singer's sewing machine was revolutionary, having a double treadle. With patent in hand, Isaac set up shop in Boston, Massachusetts and began to manufacture his invention. Even after huge settlements paid to Elias Howe, another sewing machine patent holder, Singer, through business innovations like installment buying, after-sale servicing and trade-in allowances, had the marketplace all sewn up.

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