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Calculate the number 670

NUMBERMANIA: Calculate the number 670 using numbers [5, 8, 9, 6, 93, 100] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 2

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Telephone

In 1876, the first two-way telephone conversation occurred over outdoor wires. Alexander Graham Bell had a two-way conversation with Thomas Watson over the telegraph line linking Boston and East Cambridge. Three days earlier in Boston, 6 Oct 1876, Bell's two-way telephone test of conversation with Watson had been the world's first two-way telephone conversation.

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