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20x-16 + 8x + 12x = 140
40x = 156
x = 3,9
5x-4 = 5(3,9)-4 = 19,5-4 = 15,5
2x = 2(3,9) = 7,8
3x = 3(3,9) = 11,7
4(5x-4 +2x+ 3x)= 140
10x -4 = 140/4
10x = 35+4
x = 39 / 10 = 3,9
p = 5x-4 = 5(3,9)-4 = 19,5-4 = 15,5
l = 2x = 2(3,9) = 7,8
t = 3x = 3(3,9) = 11,7
Jadi ukuran balok itu p x l x t = 15,5 x 7,8 x 11,7 cm atau 155 x 78 x 117 mm