7 x 3 2 28 July 8, 2019 16 32 64 128 7 18 x 3 2 13 28 1 3 x 7 2 =- 28 3 7 x 28 5 2 10 4x 3 28x 2 x 7 7 2 x 4 3 )= 28 3