gimmanaaa caranyaaaaa

Vkubus = 3 x 3 x 3
             = 27cm³
Vbalok = 12 x 3 x ( 7 - 3 )
            = 12 x 3 x 4
            = 144cm³
V = 27 + 144
   = 171cm³

maaf klo salah :)

V1 = s x s x s
= 3 x 3 x 3
= 27 cm3
V2 = p x l x t
= 4 x 3 x 12
= 144 cm3
V gabungan = V1 + V2
= 27 + 144
= 171 cm3 [ B ]