Question

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

Answer 1

[Ratio of calcium : carbon : oxygen ]in Chalk =  10:3:12
Total ratio = 25 parts
Carbon = 3 parts
% of carbon in chalk = 3/25 * 100 = 12%
Hope it helps.

Answer 2

$<b><i>$It is given in the question that,

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

Therefore,

Total = 10 + 3 + 12 = 25

Hence,

Percentage of carbon = × 100 %

= 3 × 4 %

= 12 %