So, the fraction of the planets in our solar system that have moons but don't have rings would be:
[tex]\frac{6}{8}-\frac{4}{8}=\frac{6}{8}-\frac{1}{2}=\frac{1}{4}[/tex]------------------------------------------------------------
Let:
T = Total playground
Fs = Fraction for the soccer field
Fb = Fraction for the basketball court
So, the remaining field will be:
[tex]\begin{gathered} R=T-Fs-Fb \\ R=1-\frac{2}{8}-\frac{3}{8} \\ R=1-\frac{5}{8} \\ R=\frac{3}{8} \end{gathered}[/tex]