Q102 of 140 Page 196

Chalk contains 10% calcium, 3% carbon and 12% oxygen. Find the amount of carbon and calcium (in grams) in kg of chalk.

Given, percentage of calcium in chalk = 10%


Percentage of carbon in chalk = 3%


Percentage of oxygen in chalk = 12%


∴ weight of chalk = kg = kg


= 2.5 × 1000 = 2500gm


⇒ Amount of carbon in chalk = 3% of 2500 = × 2500


= 75


⇒ Amount of Calcium in chalk = 10% of 2500 = × 2500


= 250


∴ amount of carbon and calcium respectively is 75 and 250


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