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MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 330

The first user who solved this task is Donya Sayah30.

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Who pushed the forward button on my weekend

Alright… Who pushed the forward button on my weekend?

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Vacuum-cast steel

In 1957, the first vacuum-cast steel made in the U.S. was a 93,900-pound ingot, 78 inches in diameter. During the production process, the gases were entrapped by vacuum-stream degassing equipment (designed by the F.J. Stokes Corporation, Philadelphia, Penn.) The ingot was poured by the Bethlehem Steel Corporation, Bethlehem, Penn. Vacuum-cast steel can be made using either an electric or an open-hearth furnace to melt the metal.

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