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

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Solution

In chalk, ratio of calcium, carbon and sand $= 12 : 3 : 10$
Total of ratio's $= 12 + 3 + 10 = 25$ and carbon $= 3$
Percentage of carbon in the chalk $3$
$= \frac{3}{25} \times 100$
$= 12 %$

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