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Question
The ratios of copper to zinc in alloys A and B are 3 : 4 and 5 : 9 respectively. A and B are taken in the ratio 2 : 3 and melted to form a new alloy C. What is the ratio of copper to zinc in C?
Options
8 : 13
3 : 5
9 : 11
27 : 43
MCQ
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Solution
27 : 43
Explanation:
`c/z = ((2 xx 3)/7 + (3 xx 5)/14)/((2 xx 4)/7 + (3 xx 9)/14)`
= `(12 + 15)/(16 + 27)`
= `27/43`
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Mixture and Allegations (Entrance Exam)
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