A tea importer blends two types of tea, one costing £5.20/kg and the other £5.60/kg, selling the mix at £6.80/kg for a 25% profit. The calculations show that the cost price is £5.44, leading to the equation 5.2T1 + 5.6T2 = 5.44. By solving the equations, it is determined that the ratio of the less expensive tea (T1) to the more expensive tea (T2) is 2:3. This ratio indicates how the teas should be mixed for optimal profit. The discussion effectively demonstrates the mathematical approach to achieving a profitable tea blend.