53. As shown in the figure, on the side $AB$ of rectangle $ABCD$, there is a point $E$, and on side $BC$, there is a point $F$. Connecting $CE$ and $DF$ intersects at point $G$. If the area of $\triangle CGF$ is $2$, the area of $\triangle EGF$ is $3$, and the area of the rectangle is $30$, then the area of $\triangle BEF$ is . $\qquad$
Reference answer: $35 / 8$