13. Chalk contains 10% calcium, 3% carbon, 12% oxygen and the remaining sand.
Find the amount of carbon and calcium (in grams) in 2 kg of chalk. Also find
the amount of sand (in kg).
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ᴄᴀʀʙᴏɴ = 3/100 × 5/2
= 3/40 × 1000
= 75 ɢʀᴀᴍꜱ
ᴄᴀʟᴄɪᴜᴍ = 10/100 × 5/2
= 1/4 × 1000
= 250 ɢʀᴀᴍꜱ .
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