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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Detailed Solution

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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