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Q.

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: 

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a

3: 8

b

9: 10

c

15: 24

d

8 :.5

answer is B.

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Detailed Solution

18 carat gold =34pure gold =34×24=18 carat gold

20 carat gold =56pure gold =56×24=20 carat gold 

Required ratio =18:20=9:10

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