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240=5x . 3x . 2x
240= 30x³
240:30= x³
8=x³
^3√8=x
2=x
panjang = 5x
= 5.2
=10cm
lebar = 3x
= 2.3
=6cm
tinggi= 2x
= 2.2
=4cm
b)Luas balok= 2(pl + pt+ lt)
= 2(10.6 + 10.4 + 6.4)
=2(60+40+24)
=2(124)
=248 cm²