# The ratios of copper to zinc in alloys A and B are 3 : 4 and 5 : 9. re

| 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?

A. 8 : 13

B. 27 : 43

C. 3 : 5

D. 9 : 11

### Right Answer is: B

#### SOLUTION

Let the quantity of Cu in new alloy be = .

Applying allegation method –

Hence Cu = 27, Zn = 70 – 27 = 43

the ratio of copper to zinc in C = 27 : 43

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The ratios of copper to zinc in alloys A and B are 3 : 4 and 5 : 9. re