List the equations: (x+y)/2 = 91① (y+z)/2 = 88 ② (x+z)/2 = 89 ③.
①-②x/2+y/2-y/2-z/2=3 x/2-z/2=3④。
④+③ x=92。
Bring x=92 into ① and ③.
The solution of (92+y)/2=9 1 gives y=90.
The solution of (92+z)/2=89 gives z=86.
Answer: 92 points for Chinese, 90 points for math and 86 points for English.