A square pyramid resting on its base is filled to half its height with 320 cm cubed of water. How much water is needed to finish filling the pyramid?

Question

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Answer 1

volume of a pyramid is bh/3

so bh/3-(bhsub2)/3=320

Need more imfo.

Answer 2

Volume of a pyramid is length x width x height/3.

the empty part on top is a little pyramid with l w and h all half the original. 1/2 x 1/2 x 1/2 is 1/8. So the empty part is 1/8 of the whole. Whole vol = 320 x 8/7

so 1/8 x 320 x 8/7 = 45.7 to finish