This table shows the number of female and male students in each science class. The number of students taking biology are _______________.

The correct answer is: 26

This table shows the number of female and male students in each science class.
Total number of male and female students taking physics = 33
Total number of male and female students taking chemistry = 21
Total number of male and female students taking biology = x
Total number of male and female students surveyed = 80
33 + 21 + x = 80
The number of students taking biology are 26.
x = 26