40 x 20 x 10 = 8000 Amount of water upto bottom of cube
12000 - 8000 = 4000 cm3 Amount of water from above bottom of cube
40 x 20 = 800
10 x 10 = 100
800 - 100 = 700 cm2 Area of water just above bottom of cube
4000 / 700 = 5.71 Height of water above bottom of cube
5.71 + 10 = 15.71 cm Height of water
It was 15.71 cm.
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