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Question

Chalk contains calcium , carbon and oxygen in the ratio $$10 :3 :12$$. Find the percentage of carbon in chalk.


Solution

We have,

$$Calcium:Carbon:Oxygen=10:3:12$$

Then,

Total parts is $$=10+3+12=25$$

Now

$$ Carbon\%=\dfrac{Carbon}{total}\times 100 $$

$$ =\dfrac{3}{25}\times 100 $$

$$ =3\times 4 $$

$$ =12\% $$

Hence, this is the answer.


Mathematics

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