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Q.

If 24-carat gold is 100 percent pure, then what percentage of 22-carat gold is pure?


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a

91 2 3 %  

b

91 1 3 %  

c

90 1 3 %  

d

None of the above 

answer is A.

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Detailed Solution

Given that, 24-carat gold is 100 percent pure.
Let 22-carat gold = 22 parts of pure gold out of 24-carat pure gold.
 % of pure gold in 22-carat gold,
  22 24 ×100 %  
11 3 ×25 % 275 3 % 91 2 3 %  
 % of pure gold in 22-carat gold =91 2 3 %  .
Hence, option 1 is correct.
 
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If 24-carat gold is 100 percent pure, then what percentage of 22-carat gold is pure?