It can be seen from the title that ① Mathematics+Chinese = 188 (points) ② Mathematics+Nature = 189 (points) ③ Chinese+Nature = 18 1 (points) ①+②+③ = Mathematics+Chinese+Mathematics+Nature. =558 (points), so math+Chinese+nature =279 (points) 279/3=93 (points) Answer math, Chinese and nature with an average score of 93 points.