An alloy of copper and nickel contains 65 % copper. A second alloy contains copper and nickel in the ratio 17 : 3. In what ratio should the two alloys be mixed so that the new mixture contains 4 times as much copper as nickel?
Explanation:
First alloy – 65% copper. ∴ 35% Nickel.
Ratio is 65 : 35
⇒ 13 : 7. 2nd alloy – Ratio is 17 : 3
Proportion of copper in the 1st alloy = 13/20
and proportion of copper in the 2nd alloy = 17/20.
Also proportion of copper in resulting alloy = 4/5.
required ratio is (17/20 – 4/5) : (4/5 – 13/20) = 1 : 3.
hence, otpion 3 is the correct answer.
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By: Amit Kumar