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b=3 m=30 dm
c=2,5 m=25 dm
V=a*b*c
V=50 dm*30 dm*25 dm=37500 dm3
Skoro argon stanowi 0,93% powietrza to:
37500 dm3- 100%
x dm3- 0,93%
x=37500 dm3*0,93%/100%
x=348,75 dm3
Odp: Argon zajmuje 348,75 dm3 powietrza