Which of the following fractions lies between 2/3 and 3/5 = ?

Answer: Option D

$$\begin{array}{rl}& \frac{2}{3}=0.666\\ & \frac{3}{5}=0.6\\ & \frac{2}{5}=0.4\\ & \frac{1}{3}=0.333\\ & \frac{1}{15}=0.066\\ & \frac{31}{50}=0.62\end{array}$$
Clearly, 0.62 lies between 0.6 and 0.666
So, $$\frac{31}{50}$$ lies between $$\frac{2}{3}$$ and $$\frac{3}{5}$$