Question

Chalk contains 3 percent of carbon 10 percent of oxygen . Find the amount in grams of each of these substances in 1 kg of chalk ..

Answer 1

(3x)+(10x)=1kg
13x=1000gm
X=1000/13
X=76.92

3x=3×76.92=230.769231
10x=10×76.92=769.2