Question

Chalk contains 3% of carbon,10% of calcium and 12% of oxygen.Find the amount in grams of each of these substances in 1kg of chalk.

Answer 1

amount of carbon in chalk in 1kg or 1000g = 3% of 1000g = 3/100 x 1000g = 30g
​amount of calcium in chalk in 1kg or 1000g = 10% of 1000g = 10/100 x 1000g =  100g
​​amount of oxygen in chalk in 1kg or 1000g =  12% of 1000 g = 12/100 x 1000g = 120g
Hope it helps...

Answer 2

I hope this will help you.