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Question

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

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Solution

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

34:56=3465

Because whenever a value say 'a' is being divided by some value say 'b' then 'a' can be multiplied by the reciprocal of 'b'.

,3465=1820=910


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