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Six coins of gold and silver of equal...

Six coins of gold and silver of equal weights melted and new coins are cast. The ratio of gold and silver in one of the coins is 2 : 1, in another two coins 3 : 5 and 7 : 5 in the remaining coins. What will be the ratio between gold and silver respectively "in the new coins? `1:1` b. `12 : 11` c. `42 : 25` d. `19 : 17`

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