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ATQ,
Quantity of the alloy = 50 kg
Quantity of silver in 50 kg alloy = (0.25 × 50) = 12.5 kg
Quantity of gold in 50 kg alloy = (0.45 × 50) = 22.5 kg
Quantity of copper in 50 kg alloy = (0.30 × 50) = 15 kg
Let the quantity of silver to be added be x kg.
According to the question,
Quantity of silver in the new alloy = (Quantity of gold + Quantity of copper)
(12.5 + x) = (22.5 + 15)
Or, x = 37.5 - 12.5 = 25
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