Related Post: 5 3 1 2 X 7 5 3 1 2x 2 )=- 7 5 3 2 X )= 7x 1 5 1 2 X 7 3 4 5 1 2 X 7 3 4 Envelopes 5 1 2 X 7 3 4 Outer Envelopes 3 1 5 X 2 7 8 5 2x 1 )= 3 X 7 5 2x 1 )- 3 3x 2 )= 7 X 4 1 3 X 2 5 =- 7 15