If \({x}, {y} \) is 25% less than, then \({y}, {x} \) is greater than.

Interpretation:
If $x$ is 25% less than $y$, then
$x = 0.75y$

Now compare $y$ with $x$:

$y = \frac{x}{0.75} = \frac{4x}{3}$

Increase from $x$ to $y$:

$\frac{y - x}{x} = \frac{\frac{4x}{3} - x}{x} = \frac{x}{3x} = \frac{1}{3}$

So, percentage increase = $33\frac{1}{3}%$

Final Answer: $33\frac{1}{3}%$