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If in 3 kg of metal, which is one- third...

If in 3 kg of metal, which is one- third silver and the rest aluminium, is mixed with 7 kg of another metal,which is two-seventh silver and the rest is aluminum. What is the ratio of silver to aluminium in the mixture?

A

`3:7`

B

`7:3`

C

`1:7`

D

`2:7`

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