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Maka = p = 5x, l= 2x, t=x
Luas perm. balok = 2(pl + pt + tl)
306 = 2(5x.2x + 5x.x + x.2x)
153 = 10 + 5 + 2
153 = 17
= 9
x = 3
berarti, p = 15, l = 6, t = 3
Vol. Balok = p x l x t
V = 15 x 6 x 3
V = 270
semoga membantu :)