In an alloy of 63 kg, the ratio of nickel to copper is 5 : 2. If the ratio is to be 2 : 5, then the quantity of copper to be further added is

In the initial 63 kg alloy, the ratio of nickel to copper is 5 : 2. The total number of parts is 5 + 2 = 7, so the parts represent 9 kg each (63 / 7). The alloy therefore contains 45 kg of nickel and 18 kg of copper. We want the new ratio of nickel to copper to be 2 : 5, meaning for 45 kg of nickel, the copper needed is (5 / 2) * 45 = 112.5 kg. Since the alloy already has 18 kg of copper, the copper to be added is 112.5 - 18 = 94.5 kg. The quantity of copper to be further added is 94.5 kg.

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