Question

chalk contains 10% calcium 3% carbon and 12% oxygen find the amount of calcium and carbon into 2 kg Chalk

Answer 1

$let \: the \:amount \: of \: chalk \: be \: 10x \\amount \: of \: calcium \: be3x \\ amount \: of \: carbon \: be \: 12x \\ so \: total \: aount \: of \: all \: 25x \\ 25x = 2000g \\ x = 80$

Answer 2

let the amount of chalk be = 10x

amount of calcium be = 3x

amount of carbon be = 12x

so , total amount of all = 25x

25x = 2000g

x = 80 [ans]