The number of participants in subjects 2 and 3 is:110-16-15-21= 58.

And after removing the number of people who only took one of the three exams:

Chinese, English, Chinese and Mathematics: 52-16 = 36;

English language and English mathematics and all three subjects: 61-15 = 46;

Mathematical Chinese and Mathematical English and all three subjects: 63-21= 42;

At this time, you can set the number of students in X, Chinese English A, Chinese Mathematics B and English Mathematics C:

x+a+b+c=58，( 1)

x+a+b=36，(2)

(1)-(2) Score: c = 22 people (the number of people taking the English math exam)

Similarly:

x+a+c=46 (3)

(1)-(3) Score: B = 12 (the number of people taking the Chinese mathematics exam).

Similarly: A = 16 people (the number of people taking Chinese and English exams)

So x = 8 people.

The number of people who passed all three subjects is 8.