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In an alloy of German silver the ratio o...

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:

A

`17: 21 : 4`

B

`51: 21 : 28`

C

`68 : 28 : 21`

D

`17 : 28 : 3`

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