There are 40 students in Class 53, 80% of whom have scored above 85 in math and 85% in Chinese.

There are 40×80%=32 people with math scores above 85.

There are 40×80%×75%=24 people with Chinese scores above 85.

There are 40× 15%=6 people with Chinese and math scores below 85.

Suppose: the number of people who score above 85 in Chinese mathematics is A, the number of people who score below 85 in Chinese mathematics is B, the number of people who score above 85 in Chinese mathematics is C, and the number of people who score below 85 in Chinese mathematics is D, then:

A+B=32，A+C=24，D=6，A+B+C+D=40。 By solving the equation, A=22. B= 10。 C=2。

Only 10 students scored above 85 in one subject of Chinese, and 22 students scored above 85 in both subjects.

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