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What 5-digit number satisfies the following requirements?

What 5-digit number satisfies the following requirements? 1. No zeroes; 2. First two digits are the same; 3. Fourth digit is twice the first; 4. Last digit is twice the third; 5. Sum of all digits is 18

Correct answers: 127

The first user who solved this task is Djordje Timotijevic.

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Shoe-recycling shop

I used to work in a shoe-recycling shop.

It was sole-destroying

Author: Alex Horne, Joke was second on August 2013 on Fringe’s best one-liner prize

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Wilhelm Pfeffer

Born 9 Mar 1845; died 31 Jan 1920 at age 74.Wilhelm (Friedrich Philipp) Pfeffer was a German botanist whose work on osmotic pressure made him a pioneer in the study of plant physiology. With Julius von Sachs, he was a leader in systematizing the fundamentals of plant physiology. In 1877, while investigating cell metabolism, he devised a semi-permeable membrane for the study osmosis. By measuring osmotic pressure, a technique he developed, Pfeffer found that pressure depends on the size of the molecules that are too large to pass through the membrane. Thus, he had a method to measure the size of such giant molecules. However, he was unable to find a mathematical relationship to predict osmotic pressure, which was furthered by the work of van't Hoff.

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