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The US exports 200 billion pounds of coal. How many tons does the US export?

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200 billion is 200,000,000,000 lbs
1 ton is 2,000 lbs.
So 200,000,000,000/2,000 = 100,000,000 tons or 100 million tons.
2,000 = 1 ton .  2,000,000,000/2,000 = 1,000,000,000 or 100 million tons

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