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?

20 kg
35 kg
55 kg
65 kg

Correct Answer: 65 kg

Explanation:

∵ 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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