$${\textbf{Step - 1: Writing given things}}$$
$${\text{Total number of matches = 20}}$$
$${\text{Percentage of matches won by them = 25% }}$$
$${\textbf{Step - 2: Calculating number of matches won}}$$
$${\text{Number of matches won = 25% of total number of matches}}$$
$${\text{Number of matches won = 25% of 20}}$$
$${\text{Number of matches won = }}\dfrac{{{\text{25}}}}{{{\text{100}}}}{\text{ }} \times {\text{ 20}}$$
$${\text{Number of matches won = 5}}$$
$${\textbf{Thus, the team won 5 matches}}$$