Question id 322 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

The ratio of weight of air to the weight of fuel in the mixture.
The ratio of the volume of air to the volume of fuel in the wing tanks prior to reaching the engine.
The ratio of volume of air to the volume of fuel in the mixture

Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane