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October 24, 2014

October 24, 2014

Posted by **Hobo** on Thursday, March 11, 2010 at 3:07pm.

A.The bottom layer is pea gravel and needs to be 2 inches deep. How many cubic inches will she need? B. The second layer is aquarium gravel and needs to be 1 inch deep. She has 400 cubic inches of gravel, does she have enough?C.The top layer is potting soil. It needs to be 5 in deep. The ptting soil comes in bags of 1,500 cubic inches. How many bags will she need?

- math -
**Ms. Sue**, Thursday, March 11, 2010 at 3:15pmHow have you started these problems?

Where did you get stuck?

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**Hobo**, Thursday, March 11, 2010 at 3:17pmthis whole thing makes no sense to me. can you please answer it?

- math -
**Ms. Sue**, Thursday, March 11, 2010 at 4:16pmThe major part of this problem involves volume.

The volume of a rectangular prism is:

V = l * w * h

Since the bottom layer is 2 inches deep --

V = 24 * 14 * 2

V = 672 cubic inches

Now figure out the volume of each of the other two layers.

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