Three plus five times two plus eight. What is the number?

Math teacher, math teacher, is it really your old man? When I was a student, I was badly abused by your old man's similar problems.

According to your teaching, the formula of this expression is 3+5*2+8=2 1.

Why not (3+5)*2+8, or (3+5)*(2+8)?

According to your teaching at that time, if it is (3+5)*2+8, its expression is the sum of 3 plus 5 times 2. What is the sum of 8?

If it is (3+5)*(2+8), then its expression is the sum of 3 plus 5. What is the product of 2 plus 8?

After so many years, I still remember your inquiry and teaching.

I don't know if the students answered correctly, please point out the maze.