DSQ: Calculating the volume of a prism - GMAT Quantitative

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Question

Given a right square pyramid and a right cone, which, if either, has greater volume?

Statement 1: The two have the same height.

Statement 2: The base of the cone and the base of the pyramid have the same area.

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Answer

Given base area height , the volume of either a pyramid or a cone is equal to

.

If we know the heights of the two figures are the same, we still need to know which has the greater base area in order to know which has the greater volume, so Statement 1 is insufficient. By a similar argument, Statement 2 is insufficient.

If we know both heights are equal and that both bases have equal area, then we know that the volumes are equal.

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