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What is the four-digit numbe...

What is the four-digit number in which the first digit is one third the second, the third is the sum of the first and second, and the last is three times the second?

Correct answers: 62

The first user who solved this task is Rutu Raj.

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Bad Breath

We should have a way of telling people when they have bad breath.
Something like, "Well, I'm bored... let's go brush our teeth."
Or, "I've got to make a phone call, hold this gum in your mouth for me, will you."

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Municipal fire alarm system

In 1852, the first municipal electric fire alarm system using call boxes with automatic signaling indicating a fire's location was placed into operation in Boston. It proved very effective in saving lives and avoiding great loss of property resulting from fire. (As recently as 16 Dec 1835, a great fire in New York City had resulted in the demolition of 600 buildings, at a loss of $20 million.) The success of Boston's fire alarm system was soon apparent, and the system spread across the United States and Canada. The inventors, William Channing and Moses Farmer, received a U.S. patent on their system on 19 May 1857 (No. 17,355). Their original 28-page proposal was given to the mayor of Boston on 27 Mar 1851 and construction began 7 Sep 1851.«

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