That is, mathematics is 3× 3 = 9 points more than the average score of China English, which is expressed as
Mathematics = (Chinese+English) ÷ 2+9, that is, Chinese+English = (Mathematics -9) × 2.
Because the score of mathematics is more than the average score of three subjects (115), it is expressed as
Math = (Chinese+English+Math) ÷ 3× (1+15) and because: Chinese+English = (Math -9 )× 2.
Math =[(Math-9)×2+Math]÷3×( 1+ 1/ 15)。
Math = 96 points