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In two alloys the rations of copper to t...

In two alloys the rations of copper to tin are 3:4 and 1:6 respectively. If 7 kg. of the first alloy and 21 kg. of the second alloy are mixed together to form a new alloy, then the ratio of copper to tin in the new alloy is :

A

`3:4`

B

`1:4`

C

`3:7`

D

`4:11`

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