Which number should replace the question mark?
FUNNY MATH: Which number should replace the question mark?Correct answers: 100
The first user who solved this task is Slobodan Strelac.
#brainteasers #math #riddles
Singer's treadle sewing machineIn 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. |