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Wang Wei talks about mathematics.
"The math score ratio between Li Hong and Wang Wei is 5: 4." That is to say, Li Hong's math score accounts for 5/9 of their total math score, and Wang Wei's math score accounts for 4/9 of their total math score.

"Li Hong is twenty-two. 5 points, Wang Wei scored 22.5 points. " Then the sum of their math scores remains the same.

"The score ratio between them is 5: 7", that is, Li Hong accounts for 5/ 12 of the total score and Wang Wei accounts for 7/ 12 of the total score.

Then the sum of their math scores is: 22.5 ÷ (5/9-5/12) =162 (points).

Then Li Hong's math score is: 162×5/9=90 (points).

Wang Wei's math score is: 162×4/9=72 (points).

Li Hong got 90 points in math and Wang Wei got 72 points in math.

I hope I can help you and adopt it.