The volume ratio of oxygen and nitrogen in the air is 21:78.660 cubic meters. How many cubic meters of oxygen and nitrogen are there in the air?

O2 660/100*21=138.6
N2 660/100*78=514.8

The volume ratio of oxygen and nitrogen in the air is 21:78. How many cubic meters of oxygen and nitrogen are there in 660 cubic meters of air?

660 × 2121 + 78 = 660 × 2199 = 140 (cubic meters); 660 × 7821 + 78 = 660 × 7899 = 520 (cubic meters); answer: 660 cubic meters of air contains 140 cubic meters of oxygen and 520 cubic meters of nitrogen

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