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I think there is no need of weight chalk
3% of 1000=3/100*1000
30gram carbon
10% of 1000=10/100*1000
100 gram calcium
12% of 1000= 12/100*1000
120 gram oxygen
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Check out the answer friend :-
1 kg=1000g
Now as we know the chalk contains 3% of carbon so to find the actual quantity of carbon(in grams) we shall find 3% of 1000g
We can write 3% as 3/100
3/100*1000=30g
Similarly,
Calcium= 10/100*1000=100g
And,
12/100*1000=120g
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