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Calculate the number 4912

NUMBERMANIA: Calculate the number 4912 using numbers [7, 8, 6, 5, 97, 633] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 11

The first user who solved this task is Nasrin 24 T.

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Donkeys at Christmas

Q: What do donkeys send out near Christmas?

A: Mule-tide greetings.

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Submarine

In 1776, the first U.S. submarine built for wartime use, the American Turtle, was used in New York harbour to attach explosives to the hull of the Eagle, Admiral Howe's flagship. Known as a "torpedo" the weapon was a cask with 150 lbs of black powder and a clockwork time fuse. Because it separated from the ship before it exploded, little damage was done. The submarine, just large enough for one occupant, was operated by Ezra Lee, turning a 24-in diam. two-bladed wooden propeller giving up to3 knots speed. It was built by David Bushnell of Saybrook, Conn., who provided it with a rudder and a second propeller for vertical movement. Water taken in as ballast to submerge was expelled by hand-pump to resurface.«*

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