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  1. The proportion of Zinc and Copper in a brass piece is 13 : 7. How much zinc will be there in 100 kg of such a piece ?
    1. 20 kg
    2. 35 kg
    3. 55 kg
    4. 65 kg
Correct Option: D

∵ 20 kg of brass contains zinc = 13 kg
∴ 100 kg of brass contains zinc = (13/20) x 100 kg. = 65 kg.


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