Question

chalk contains carbon, calcium and oxygen in the ratio 3:10:12. find the percentage of calcium in the chalk.​

Answer 1

Step-by-step explanation:

$Percentage \: of \: calcium \\ = \frac{10}{3 + 10 + 12} \times 100 \\ \\ = \frac{10}{25} \times 100 \\ \\ = 10 \times 4 \\ \\ = 40 \% \\ \\ \purple{ \boxed{ \therefore \: Percentage \: of \: calcium = 40 \%}}$