The 7 equal segments split $\left[0, \tfrac{20}{73}\right]$ into pieces of length $\tfrac{1}{7}\cdot\tfrac{20}{73}$.

$\frac{20}{73} \approx 0.274, \quad \text{each step} \approx 0.0391$

So $e \approx 0.196$ and $f \approx 0.235$. Since $\frac{20}{93} \approx 0.215,$ the value $\tfrac{20}{93}$ lies between $e$ and $f$.