Question:
A circle is centered at $(5,15)$ and has a radius of $\sqrt{130}$ units. Point $Q = (x,y)$ is on the circle, has integer coordinates, and the value of the $x$-coordinate is twice the value of the $y$-coordinate. What is the maximum possible value for $x$?

Answer:
The equation of a circle centered at $(h,k)$ with radius $r$ is $(x-h)^2+(y-k)^2=r^2$, so the equation of the circle is \[
(x-5)^2+(y-15)^2=130.
\] Since $x=2y$, we substitute to find  \[
(2y-5)^2+(y-15)^2=130.
\] Expanding the left-hand side and subtracting 130 from both sides, this equation becomes \[
5y^2 -50y+ 120=0.
\] The left-hand side of this equation factors as $5(y-6)(y-4)$, so $y=6$ and $y=4$ are the two possible $y$-coordinates.  Therefore, the possible $x$-coordinates are 12 and 8, the largest of which is $\boxed{12}$.