An alloy A contains two elements, copper and tin in the rati

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MATH

42

M: +1.00/-0.33

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?

[CDS-I 2018 Elementary Maths(PYSP)]

A 3 kg

B 4 kg

C 5 kg

D 7 kg