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Beijing normal university printing plate sixth grade second volume mathematics problem.
The radius of the glass cylinder is 120÷2=60 cm.

So the volume of rising water is 3.14× 60× 60× 2.5 = 28,260 cubic centimeters.

The radius of a small cylinder is 60÷2=30 cm.

So the bottom area is 3. 14×30×30=2826 square centimeters.

So the height is 28260÷2826= 10 cm.