3 x 5 )= x 21 July 8, 2019 16 32 64 128 3 x 5 x 21.5 3 x 5 x 21.5 box 3 x 5 x 21.5 in cm 3 x 5 3 x 3 216 3 5 x 21 10 3 x 5 2 x 6 x 4 x 21 3 x 21 )+ 2 x 4 )= 5 x 11 3 x 1 2 3x x 5 )= 21 4 x 5 )+ 3 x 5 )= 21 3 x 5 )- 3x 21 3 x 5 )- 3x 21 simplified 2x 3 x 5 21 x 3 x 1 3 x 5 216 3 5 x 210 3 x 4 )- 21 7 5 x )+ 21x
