3 * 3 * 2,5=22,5 m3
22,5 : 100 = 0,225 m3
0,225 * 21 = 4,725 m3 = 4725 dm3
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v=a*b*c
v=3m*3m*2,5m
v = 22,5m³ powietrza
22,5m³ powietrza ---- 100%
x m³ tlenu -------------- 21%
x = 4,725m³ tlenu
x = 4725dm³ tlenu
3 * 3 * 2,5=22,5 m3
22,5 : 100 = 0,225 m3
0,225 * 21 = 4,725 m3 = 4725 dm3