# Chalk Contains Calcium, Carbon and Oxygen in the Ratio 10:3:12. Find the Percentage of Carbon in Chalk. - Mathematics

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

#### Solution

Ratio of calcium, carbon, and oxygen = 10: 3: 12

As 10 + 3 +12 = 25,

Therefore, percentage of carbon = 3/25 xx 100 = 12%

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#### APPEARS IN

NCERT Class 7 Maths
Chapter 8 Comparing Quantities
Exercise 8.3 | Q 7.1 | Page 171