The standard form of an ellipse is $\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1$, where $a$ is the semi-major axis and $b$ is the semi-minor axis.
The given equation is $16x^2 + 25y^2 = 400$. Dividing each term by $400$ gives us $\frac{x^2}{25} + \frac{y^2}{16} = 1$.
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