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2 (Pl + Pt + Lt) = Luas Permukaan
2 ( 5x.2x + 5x.x + 2x.x) =306
2(10x² +5x² +2x²) = 306
17x² = 153
x² = 9
x= 3
P = 5x3 = 15
L=2x3 = 6
t= x = 3
P x L x T = Volume
= 15*6*3
=270cm³
p = 5x
l = 2x
t = x
LP = 2(p × l) + 2(p × t) + 2(l × t)
306 = 2(5x × 2x) + 2(5x × x) + 2(2x × x)
306 = 2(10x²) + 2(5x²) + 2(2x²)
153 = 10x² + 5x² + 2x²
153 = 17x²
9 = x²
√9 = √x²
3 = x
p = 5x
= 5(3)
= 15 cm
l = 2x
= 2(3)
= 6 cm
t = x
= 3 cm
V = p × l × t
= 15 cm × 6 cm × 3 cm
= 270 cm³
Jadi volume balok tersebut adalah 270 cm³