Question

Find 1 rational numbers between 2.1 and 2.2

Answer 1

The rational number between $a$ and $b$ is given as $\frac{a+b}{2}$

Here $a=2.1$ and $b=2.2$

So the rational number is given as $\frac{2.1+2.2}{2}=\frac{4.3}{2}=2.15$