-4.3 is rational but not an intiger
Capacity of the pool = 30 x 20 x 5 = 3000 ft³
Amount of water already filled = 30 x 20 x 4 = 2400 ft²
Amount of water needed to full the pool = 3000 - 2400 = 600 ft²
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Answer: 600 ft² of water is needed to fill up the pool.
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Correct answer is third option ---C in edge
1,200 because 4x 3 is 12 and 40 x 30=1,200