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Calculate the number 1924

NUMBERMANIA: Calculate the number 1924 using numbers [9, 5, 9, 1, 21, 106] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 40

The first user who solved this task is Sanja Šabović.

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Black American invention

In 1894, Black American inventor Fredrick J. Loudin was issued a U.S. patent for a "Key Fastener" (No.512,308). The invention was a device designed to attach to the knob-shaft or door-handle above the key-hole and fasten the door key in place in the lock by engaging with the eyed-end of the key to keep it from being turned in the lock. As the patent described, this would prevent disengaging the key, as might otherwise be done by a burglar from the outside of the door with some suitable implement, inserted through the key-hole. Loudin's first patent was issued 12 Dec 1892 for a window "Fastener for the Meeting Rails of Sashes" that permitted the window to be locked either closed or partially opened (No. 510,432).

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