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An alloy A contains two elements, copper...

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 ?

A

3 kg

B

4 kg

C

5 kg

D

7 kg

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