Question

Chalk contains 3% of carbon , 10% of calcium and 12% of oxygen and the remaining sand . Find the amount of carbon and calcium (in grams ) in 5/2 kg of chalk . Also find the amount of sand ( in kg).

Answer 1

$5 \frac{1}{2} \times 10 \frac{1}{100} = 5 \frac{1}{20} = .25or25\%$