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Do you know the answer on page 16 of the sixth grade math book published by Beijing Normal University?
The volume of sand above the hourglass: 1/3× 3. 1.4× (2/2) square× 3 = 3.1.4 (cm) cubic.

The volume of sand in the lower part of the hourglass: one third× 3.1.4× (6/2) square× 9 = 84.78 (cm) cubic one third× 3.1.4×1.5 square× (9-4.5) =/.

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