What is the combined gallons in the standard fuel tank of the Cessna 152 that is usable?

The standard fuel tank of the Cessna 152 has a total capacity of 26 gallons, but the usable fuel is slightly less due to factors like fuel system design and safety considerations. The usable fuel is 24 gallons.

This means that when flying a Cessna 152, pilots can rely on 24 gallons of fuel for their operations, which includes allowances for maintaining fuel reserve practices and ensuring that all usable fuel can be drawn from the tanks without risk of engine failure due to fuel starvation. The precise amount of usable fuel is critical for flight planning, as it affects how far the aircraft can fly before needing to refuel.

The other options represent capacities either too high or too low for the standard specification of usable fuel in the Cessna 152, making them unsuitable as factual references for this aircraft's fuel system.