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  1. A ore contains 12% copper. How many kg of ore are required to get 69 kg of copper ?
    1. 424 kg
    2. 575 kg
    3. 828 kg
    4. 17362/3 kg
Correct Option: B

&becaus 12% of W = 69
⇒ W = (69 x 100) / 12 = 575 kg


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