\dfrac{20}{b}+\dfrac{11b}{2}+\dfrac{2012}{2b}\ge \dfrac{20}{2}+\dfrac{22}{2}+\dfrac{2012}{4}=524

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.