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

Answer» (i)ratio given in a chalk`= 10 : 3: 12`
sum of ratios `= 25`
`%C= 3/25 xx 100 = 12 %`
(ii)weight of C`= 3g`
weight of chalk=`x g`
Acc to question
`3/x = 3/25`
`x =25 g`
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