The problem asks to find the size of angle $x$ given a straight line with angles $20^{\circ}$, $x$, and $65^{\circ}$ on it.

1. Problem Description

The problem asks to find the size of angle $x$ given a straight line with angles $20^{\circ}$, $x$, and $65^{\circ}$ on it.

2. Solution Steps

The sum of angles on a straight line is $180^{\circ}$.

Therefore, we have the equation:

$20^{\circ} + x + 65^{\circ} = 180^{\circ}$

$x + 85^{\circ} = 180^{\circ}$

$x = 180^{\circ} - 85^{\circ}$

$x = 95^{\circ}$

3. Final Answer

The size of angle $x$ is $95^{\circ}$.