13 x 7 9 July 8, 2019 16 32 64 128 13 x 7 9 13 x 7 91 13 7 x 9 4 23 28 13 7 x 9 4 13 7 x 9 8 2x 13 7 x 9 13 2 5 7 x 3 9 5x 13 x 9x 7 13 90 x 7 5x 13 x ≥ 9x 7 13 x 9 x 7 box 7 13 x 6 9 147 7 x 13 )= 98 5 5x 9 13 x 7 4 7 13 x 49 97
