Optimum altitude

[futureflyer]

Hi all,

I'm wondering if it's possible to calculate an aircraft's optimum altitude using these four things:
1. zero fuel weight.
2. amount of fuel on board.
3. fuel flow (kg/min) at a specific height.
4. normal cruise speed in mach or kts at a specific height.

Can somebody tell me whether this is possible or not? And if it is possible, how?

Thanks very much,

FutureFlyer