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Calculate the number 399

NUMBERMANIA: Calculate the number 399 using numbers [4, 2, 7, 4, 22, 670] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 2

#brainteasers #math #numbermania

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Nine lives

A tom cat and a tabby cat were courting on a back fence at night.

The tom leaned over to the tabby with pent up passion and purred... "I'll die for you"

The tabby gazed at him from under lowered eye lids and asked,

"How many times?".

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Automat

In 1902, the first restaurant with vending machine service was the Automat Restaurant at 818 Chestnut Street in Philadelphia, Pennsylvania. It was Horn & Hardart, a cavernous, waiterless establishment that was a combination of fast-food, vending and a cafeteria. Horn & Hardart Automats expanded into a chain reaching Manhattan in 1912. With their uniform recipes and centralized commissary system of supplying their restaurants, the Automats were America's first major fast-food chain. Customers put nickels into slots in the Automats and turned a knob. In the compartment next to the slot, food revolved into place for the customer to receive through a small glass door.

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