30 4 x 2 ) 15 3 July 8, 2019 16 32 64 128 30 4 x 2 )+ 15 3 30 4x x 2 )+ 15 3 30 x 4 1/2 30 x 4 1 30 x 4 x 4 30 x 4 = 30 x 15 x 10