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Calculate the number 6820

NUMBERMANIA: Calculate the number 6820 using numbers [9, 2, 9, 9, 36, 361] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 22

The first user who solved this task is Manguexa Wagle.

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Todd Barry: Hearing Aid

Saw a great product advertised -- it was a hearing aid made to look like a Bluetooth headset. Its for people who are embarrassed about wearing a hearing aid but not about wearing a Bluetooth headset.

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Thomas Davenport

Died 6 Jul 1851 at age 48 (born 9 Jul 1802). American inventor of what was probably the first commercially successful electric motor, which he used with great ingenuity to power a number of established inventions. Though several other inventors had experimented with motors, Davenport was the first to secure a US patent (No. 132 on 25 Feb 1837) for his direct current motor. He incorporated the concept of the electromagnet invented by Joseph Henry in a way that produced a rotary motion using his own idea of a commutator and brushes to control the direction of current flow. He used a motor he built to power shop machinery, and also built the first electric model railroad car.

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