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The ratio of copper and zinc in brass is 13 : 7. How much zinc will be there in 100 kg of brass?


1. 45 kg
2. 3.5 kg
3. 40 kg
4. 35 kg
5. None of these.

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Correct Answer - Option 4 : 35 kg

Given:

Ratio of copper and zinc = 13 : 7

Calculation:

Let total units is 20 kg

So, in 20 kg of brass zinc will be 7 kg and copper is 13 kg

In 100 kg of brass zinc will be

⇒ 100 × (7/20)

⇒ 35 kg

The zinc in 100 kg of brass is 35 kg. 

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