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Question

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


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 $$3$$
$$= \dfrac{3}{25} \times 100$$
$$= 12\%$$

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