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Given that 24 carat gold is pure gold...

Given that 24 carat gold is pure gold; n18 carat gold is `3/4` gold and 20 carat gold is `5/6` gold, the ratio of the pure gold in 18 carat gold to the pure gold in 20 carat gold is `5:8` b. `8:5` c. `9: 10` d. `15 : 22`

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