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UPSC CDS Math Ratio Proportion and Variation Questions

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Question : 9

Total: 20

An alloy A contains two elements, copper and tin in the ratio of 2 : 3, whereas an alloy B contains the same elements in the ratio of 3 : 4. If 20 kg of alloy A, 28 kg of alloy B and some more pure copper are mixed to form a third alloy C which now contains copper and tin in the ratio of 6 ; 7, then what is the quantity of pure copper mixed in the alloy C ?

3 kg
4 kg
5 kg
7 kg

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