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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)
153 = (5x × 2x) + (5x × x) + (2x × x)
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