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t = 1,5 m = 15 dm
V bak = πr²t
V bak = 22/7 × 3,5² × 15
V bak = 577,5 dm³ = 577,5 liter
Sisa air
= 577,5 - 308
= 269,5 liter
V sisa = 269,5
πr²t = 269,5
22/7 × 3,5² × t = 269,5
38,5t = 269,5
t = 269,5 : 38,5
t = 7 dm = 70 cm