There are 42-28= 14 people with excellent math scores.

Only 37-28=9 people get excellent Chinese.

Total number of people = only those who are excellent in Chinese+only those who are excellent in mathematics+those who are not excellent in both subjects+those who are excellent in both subjects = 14+9+28 = 60 people.

Law of addition:

When using "truncation method" in addition and subtraction, add and subtract directly from the upper left bit (and pay attention to whether the next bit needs carry and dislocation) until you get the answer with required accuracy. When using truncation method in multiplication or division, in order to make the result as accurate as possible, we need to pay attention to the direction of truncation approximation:

First of all, to expand (or shrink) a multiplier, we must shrink (or expand) another multiplier.

Second, to expand (or reduce) the dividend, you need to expand (or reduce) the divisor. If it is the sum or difference of two products (that is, a*b+/-c*d).

Third, expand (or shrink) one side of the plus sign. You need to shrink (or expand) the other side of the plus sign.

Fourth, to expand (or shrink) one side of the minus sign, you need to expand (or shrink) the other side of the minus sign.