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Cutting Copper Ore Rock

Aug 21, 2021 The copper ore forms only 0.7 of the rock. We need to find a number that we can multiply by .007 to get 90 kg. Dividing 90 kg by .007 will give us that numberapproximately 12,860 kg. Multiplying that number by 2.2 poundskg would give us the number of pounds about 28,300 pounds.

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