Question

chalk contains calcium carbon and oxygen in the ratio 10:3:12
find the percentage of carbon and if carbon is 3gm so what is the weight of chalk stick.

Answer 1

calcium : carbon : oxygen
10 : 3. : 12
x. : 3 mg. : y
carbon = 3 mg
1 = 1 mg

10 + 12 +3 = weight of chalk

10 mg + 12 mg + 3 mg

25 mg. is it answer

Answer 2

your answer is

ratio of calcium , carbon and oxygen is 10:3:12

add all numbers in ratio

10+3+12

25

percentage of carbon is $\frac{3}{25}$×100 = 12

(2)  let the weight of stick be x

$\frac{12}{100}$ × x = 3

x = 25 g

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