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Given that 24 carat gold is pure gold, 18 carat gold [3/4] gold and 20 carat gold is [5/6] gold. Find the ratio of the pure gold in [18] carat gold to the pure gold in [20] carat gold

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5:8

9:10

15:24

8:5

answer is B.

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Detailed Solution

Concept- To answer this question, we use the concept that 18K gold is

,Pure gold and 20, Carat gold is

For pure gold, 24k gold is pure gold, so you can easily get the ratio you need by entering a value and further examining the ratio.
Given 24 carat gold is pure gold
18 carat is

of pure gold
20 carat gold is

gold
The ratio of pure gold in 18 carat gold in 20 carat gold is :

This is because you can multiply "a" by the reciprocal of "b" by dividing a value such as "a" by a value such as "b".

Hence, the correct answer is option 2) 9 : 10

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