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The information provided in the post IS NOT ENOUGH to get the unique and correct answer.
In addition, one needs to know which dimensions relate to the BASE of the tank and which one dimension is the height of the tank.
The answer DEPENDS on these details.
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To see other similar solved problems, look into the lesson
- Water level rise in a tank after submerging bodies
in this site.
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In simple terms, the water rise is equal to the submersed body volume divided by the area of the tank floor.