In what ratio must a jeweller melt 22-carat gold with 18-carat gold to obtain 20.5-carat gold?
Correct answer D. 5:3
Explanation
By the rule of alligation, 22-carat : 18-carat = (20.5 - 18) : (22 - 20.5) = 2.5 : 1.5 = 5 : 3.
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