Quantitative Aptitude Ratio and Proportion Simple Ratios

In an alloy of German Silver the ratio of copper to zinc was 17 : 7, while that of nickel to zinc was 4 : 3. The ratio of copper to zinc to nickel in the alloy was:

1

17 : 21 : 4

2

51 : 21 : 28

3

68 : 28 : 21

4

17 : 28 : 3

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