Question

find the rational number between 1/2 and 7/8​

Answer 1

There are many rational numbers between $\frac{1}{2}$ and $\frac{7}{8}$

But, the simplest answer would be the arithmetic mean between them.

$\frac{\frac{1}{2} + \frac{7}{8}}{2}$

$\frac{\frac{4}{8} + \frac{7}{8}}{2}$

$\frac{11}{16}$

So, 11/16 is the answer.