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Question -

(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 3 g, what is the weight of the chalk stick?



Answer -

(i) Sum of the ratio parts = 10 + 3 + 12 = 25
∴ Percentage of carbon in chalk
 
Hence, the Percentage of carbon in chalk = 12%
(ii) Weight of carbon = 3 g
∴ Weight of chalk = =3/3 × 25 g = 25 g
Hence, the weight of chalk = 25 g

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