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6 × π r³ = π r² Δt (π dicoret)
6 × × 7 × 7 × 7 = 14 × 14 × Δt
2744 = 196 × Δt
Δt = 14
t₂ = t₁ + Δt
= 30 + 14
= 44
Jadi, tinggi tabung setelah dimasukkan 6 bola besi adalah 44 cm