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Six coins of equal weight made up of an alloy of gold and silver are melted to make another set of six coins .The ratio of gold and silver in a coins is in ratio of `2:1` , in two coins this ratio is `3:5` , and for ramaining coins this ratio is `7:5`.Find the ratio of gold and silver in new coins ?

A

`12:11`

B

`1:1`

C

`19 :17`

D

`42:45`

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