a) 15
[tex] \frac{1}{2} \times 30 = \frac{30}{2} = 15[/tex]
b) 10
[tex] \frac{1}{3} \times 30 = \frac{30}{3} = 10[/tex]
c) 1
[tex] \frac{1}{5} \times 5 = \frac{5}{5} = 1[/tex]
