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If for every 2 there is 3, then for every 12 it is 18.you simply divide 12 by 2 then multiply that by 3 and 3x6 is 18.
Maximum constituent is nitrogen, by 78%. Then comes oxygen by 21%. Remaining 1% will be Argon(0.9%), carbondioxide(0.03%), water vapour, hydrogen, ozone, methane, carbon monoxide, neon, helium, krypton and even xenon
Composition of air (% by volume):Nitrogen (N2): 78.09%Oxygen (O2): 20.95%Argon (Ar): 0.93%Carbon dioxide (CO2): 0.038%Others (less than 0.002% each): Neon (Ne), Helium (He), Krypton (Kr), Hydrogen (H2), Xenon (Xe).See the Related Links for "MIStupid.com: Composition of air" to the bottom for the answer.Our atmosphere also contains water vapor. In addition, Earth's atmosphere contains traces of dust particles, pollen, plant grains and other solid particles.
A percentage is a ratio of two numbers. To make a percentage, you divide one number with the other and then multiply that number by 100. For example what is the percentage of neon fish to cardinal fish when there is a total of 200 fish and 50 are neons. One would divide 50/200 and get the answer of 0.25. Then 0.25 x 100 = 25. So the answer is 25% of the fish are neons. Giving a number and asking what is it as a percentage is a non-sequitor. Something that doesn't make logical sense.