# How to create interrelated sliders?

Say I want a slider that controls the value of $x$ and another slider that controls the value of $2x$, how would I go about it?

-
Is it purely abstract question or you need this for something else? I am curios what you're trying to achieve with this. – Vitaliy Kaurov Feb 5 '12 at 22:47
Need this for a tool that helps me to play around with speed (split time) / time / distance for the rowing machine. – Peteris Feb 6 '12 at 10:20

{Slider[Dynamic[x], {0, 10}],

The documentation explains, under More Information, that "Dynamic[expr,f] makes interactive operations not change expr except by virtue of the evaluation of f[val,expr]. ". Otherwise, Mathematica attempts to assign a value to 2x.