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S₁₀ = 10Q
S₃₀ = S₁₀ + S₂₀ = 20P + 10Q
P₃₀ = S₃₀ / 30 = (20P + 10Q) / 30 = (2P + Q) / 3
El promedio de notas de los 30 estudiantes es (2P + Q) / 3