Solutions; Assuming that the price of water after the price increase is X, then the current price of water is 66% X, calculated according to the meaning of the question; [(27.6 ÷ 66% x)+5] x = 5641.812+5x = 565x =14.182x = 2.836 ≈ 2.8 (Yuan The comprehensive water price of this hearing scheme is 2.8 yuan.