There are two alloys P and Q made up of silver, copper and aluminium. Alloy P contains 45% silver and rest aluminum. Alloy Q contains 30% silver, 35% copper and rest aluminium. Alloys P and Q are mixed in the ratio of 1:4.5. The approximate percentages of silver and copper in the newly formed alloy is:
Explanation:
P and Q are mixed in the ratio 1 : 4.5 i.e., 2 : 9.
Assume that 1 kg of P is mixed with 4.5 kg of Q.
1 kg of P has 0.45 kg of silver.
4.5 kg of Q has (0.3 × 4.5 =) 1.35 kg of silver and (0.35 × 4.5 =) 1.575 kg of copper.
Thus, the newly formed alloy of 5.5 kg has 1.8 kg of silver and 1.575 kg of copper.
∴ % of silver ≈ 33 and % of copper = 29
Hence, option (a).
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