"You're creating a standard curve for pyruvate. You need to create a standard with 20 micromoles in a cuvette. How much 100 mM pyruvate would you need?"

My understanding is to solve for VOLUME using the equation:

micromoles = (mM)(volume in ml)

20 micromoles = (100mM)(x)
Solve for x

x = 0.2mL

Am I on the right track?