a chalk contains carbon calcium and oxygen in the ratio 3:10:12.find the percentage of carbon calcim and oxygen simultaneously
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Composition of the chalk,
Carbon => 3 parts
Calcium => 10 parts
Oxygen => 12 parts
Total no. of parts = 3+10+12
= 25 parts
Total percentage of carbon = 3*100/25
= 12%
Total percentage of calcium = 10*100/25
= 40%
Total percentage of oxygen = 12*100/25
= 48%
Carbon => 3 parts
Calcium => 10 parts
Oxygen => 12 parts
Total no. of parts = 3+10+12
= 25 parts
Total percentage of carbon = 3*100/25
= 12%
Total percentage of calcium = 10*100/25
= 40%
Total percentage of oxygen = 12*100/25
= 48%
shisan:
why u have divided by 25
tell me
because it is the total number of parts in the chalk
and the formula used in such type of questions is: No. of parts of that particular thing * 100/ total no. of parts
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