Question:
You have two circles, one with radius $r$ and the other with radius $R$. You wish for the difference in the areas of these two circles to be less than or equal to 5$\pi$. If $r+R=10$, what is the maximum difference in the lengths of the radii?

Answer:
We want $\pi R^{2}-\pi r^{2}\leq 5\pi$. Dividing by $\pi$, we have $R^{2}-r^{2}\leq 5$. Factor the left-hand side to get $(R+r)(R-r)\leq 5$. Substituting 10 for $R+r$ gives $10(R-r)\leq 5 \implies R-r \leq 1/2$. So the maximum difference in the lengths of the radii is $\boxed{\frac{1}{2}}$.