🧩Penny's car 01 small ver. Human-written Copy + Revise

3 grids · reconstruct grid #3 · NARC on 6/9 models

Grid Sequence
Penny's car has a 100-liter fuel tank. She starts her trip with the tank full of 89-octane gasoline. After using half of the fuel, she refills the tank with 91-octane gasoline. Later, after using 40 liters of the mixed fuel, she refills the tank to full again with 91-octane gasoline. Penny wants to know how much 89-octane and 91-octane gasoline are in the tank now.
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