Question

Chalk contains calcium,carbon and oxygen in the ratio 10:3:12.Find the percentage of carbon in a chalk and in a stick of chalk, carbon in 3g what is the length of chalk stick?
no idea what the length of the chalk stick is, since you have given neither density nor size.

All we know is that the carbon is 3/25 = 12% of the total mass.
carbon is 3/25 = 12/100 = 12%

No idea. You did not tell me the diameter of the stick.

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