these triangles are identical, bc they have the same angles. (top angle is the same, and two bottom angles are same for all 4 of them). if identical = true, then the bases are ratios. therefore
ab+cb : cb = 22 : 2.75
ab+cb : 5 (cb) = 8
ab+5 : 5 = 8
ab+5 = 40
ab = 35