Given that 24 carat gold is pure gold, 18 carat gold is 34 gold and 20 carat gold is 56 gold the ratio of the pure gold in 18 carat gold to the pure gold in 20 carat gold is:

18 carat gold =34pure gold =34×24=18 carat gold20 carat gold =56pure gold =56×24=20 carat gold Required ratio =18:20=9:10

18 carat gold =34pure gold =34×24=18 carat gold20 carat gold =56pure gold =56×24=20 carat gold Required ratio =18:20=9:10

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Given that 24 carat gold is pure gold, 18 carat gold is $\frac{3}{4}$ gold and 20 carat gold is $\frac{5}{6}$ gold the ratio of the pure gold in 18 carat gold to the pure gold in 20 carat gold is:

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3: 8

9: 10

15: 24

8 :.5

answer is B.

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18 carat gold $= \frac{3}{4}$ pure gold $= \frac{3}{4} \times 24 = 18$ carat gold

20 carat gold $= \frac{5}{6}$ pure gold $= \frac{5}{6} \times 24 = 20$ carat gold

Required ratio $= 18 : 20 = 9 : 10$

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