Question

1) Chalk contains calcium,carbon and oxygen in the ratio 10:3:12. Find the percentage pf carbon in chalk.
2) If in a stick of chalk, carbon is 3g, what is the weight of the chalk stick?​

Answer 1

Answer:

2) weight of chalk = 75gr

Step-by-step explanation:

10:3:12

=10×3+3×3+12×3

=75 gr

Answer 2

${ \bold{ \sf{ Answer1:-}}}$

${ \text{Given}}$

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

${ \text{To \: Find}}$

• Percentage of carbon in chalk =??

${ \text{Solution}}$

Total ratio of chalk =

$\implies{ \text{10 + 3 + 12}}$

$\implies{ \text{25}}$

So percentage of carbon in chalk

$\implies{ \dfrac{3}{25} \times 100}$

${ \boxed{ \implies{ \text{12 \: percent}}}}$

Therefore percentage of carbon in chalk is 12%

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${ \bold{ \sf{</u></em></strong><strong><em><u>A</u></em></strong><strong><em><u>nswer2</u></em></strong><strong><em><u>:</u></em></strong><strong><em><u>-</u></em></strong><strong><em><u>}}}$

${ \text{</u></em></strong><strong><em><u>G</u></em></strong><strong><em><u>i</u></em></strong><strong><em><u>ven}}$

• Amount of carbon in sick of chalk =3g

${ \text{ To \: Find}}$

• Weight of chalk stick =??

${ \text{ Solution}}$

• Let the weight of chalk stick be = xg

Then

12% of x = 3

$\implies{ \dfrac{12}{100} \times x = 3}$

${ \boxed{ \implies{ \text{x = 25g}}}}$

Therefore weight of the chalk stick is = 25g

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