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l = x
t = 5
luas balok = 2(pl + pt + lt)
236 = 2 ((x+2)x + (x+2)5 + x.5)
236 = 2 (x² + 2x + 5x + 10 + 5x)
236 = 2 (x² + 12x + 10)
118 = x² + 12x + 10
x² + 12x + 10 - 118 = 0
x² + 12x - 108 = 0
(x + 18) (x - 6) = 0
x = -18 atau x = 6
tidak mungkin ukuran adlh bil negatif, jadi x = 6
maka:
p = 6+2 = 8 cm
l = 6 cm
t = 5 cm
volume balok = p x l x t
= 8 x 6 x 5
= 240 cm³
semoga membantu ya :)