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

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Solution

i) Ratio of calcium, carbon and oxygen = 10:3:12
As 10 + 3 + 12 = 25,
Therefore, percentage = $\frac{3}{25} \times 100 = 12 %$

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10 : 3 : 12

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

(ii) If in a stick of chalk, carbon is 3g, what is the weight of the chalk stick?

Chalk contains $10 %$ calcium, $3 %$ carbon and $12 %$ oxygen, Find the amount of carbon and calcium (in grams) in $2 \frac{1}{2}$ kg of chalk.

10 : 3 : 12

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