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Verified answer
FLUIDA STATISm₁ = 2 kg. A₁ = 2 cm²
m₂ = M kg. A₂ = 30 cm²
P₁ = P₂
F₁ / A₁ = F₂ / A₂
m₁ g / A₁ = m₂ g / A₂
m₁ / A₁ = m₂ / A₂
m₂ = (A₂/A₁) m₁
M = (30/2) × (2 kg)
M = 30 kg ✔️