Two alloys contain 70% and 40% copper respectively. In what ratio must they be mixed to obtain an alloy containing 50% copper? MCQ with Answer and Explanation

Question

Two alloys contain 70% and 40% copper respectively. In what ratio must they be mixed to obtain an alloy containing 50% copper?

A. 3:2

B. 1:1

C. 2:1

D. 1:2

Answer: Option D

Solution (By JKSSB Mock Tests)

By alligation: (70-50):(50-40) = 20:10 = 2:1. The ratio of the alloys is inverse: 1:2.

This question belongs to: Maths Percentage

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