Question

Chalk contains 10% calcium, 3% carbon and 12% oxygen. Find the amount of carbon and calcium (in grams) in (2 + 1/2) Kg of chalk.​

Answer 1

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Answer 2

In chak,

calcium =10%

Carbon =3%

Oxygen =12%

Remaining =100-(10+3+12)=100-25=75%

Sand=75%

$weight \: of \: chalk \: = 2 \frac{1}{2} = \frac{5}{2} kg$

$amount \: of \: carbon \: = \frac{5}{2} \times \frac{3}{100} = \frac{3}{40} kg$

$= \frac{3}{40} \times 1000 = 75grams$

$amoumt \: of \: calcium \: = \frac{5}{2} \times \frac{10}{100} = \frac{1}{4} kg$

$250 \: grams$

$and \: amounts \: of \: sand \: = \frac{5}{2} \times \frac{75}{100} \: = \frac{15}{8} kg$

$= \frac{15}{8} = 1.875 \: kg$

Answer is 1.875kg