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MATH PUZZLE: Can you replace...

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

Correct answers: 2987

The first user who solved this task is Дејан Шкребић.

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21st Century Newspaper

I was visiting my daughter last night when I asked if I could borrow a newspaper.

"This is the 21st century," she said. "We don't waste money on newspapers. Here, use my iPad.".

I can tell you this... That fly never knew what hit him!

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Patent leather

In 1819, the first patent leather manufactured in the U.S. was produced in Newark, N.J., by Seth Boyden (17 Nov 1788-31 Mar 1870) at the tannery he had established in 1813. At first, the varnish was dried in the heat of the sun, but was later dried in a wam room. In 1820, Boyden made an oven able to hold 16 skins. This leather, treated with a coating based on linseed-oil to give it a high gloss finish, was mostly used for fancy work and for shoes. Boyden is remembered for a variety of other inventions, including malleable cast iron, a nail-making machine, a cut-off switch for steam engines, a method for producing zinc from its ore and developed a hybrid strawberry.«

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