Question

A class contains 16 boys and 10 girls of which half of the girls are fat. Find the probability that a student chosen at random is a boy or a fat student.

Answer 1

Total number of students = 16+10 = 26

Number of fat students = 5 (only girls)

$P = \frac{16}{26} + \frac{5}{26} - \frac{0}{26} \\ = \frac{16+5}{26} \\ = \frac{21}{26}$