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Surface Area Block Problem

```
Date: 08/05/97 at 22:32:19
From: Lilly Joseph
Subject: Block surface area problem

Dear Dr. Math,

This surface area problem was in my geometry book and I didn't
understand how to solve it. Please explain it to me.

Problem: Cheese is aged in large blocks. A block with length of
15 cm, width of 15 cm, and height of 30 cm is cut up by a
distributor into dimensions of 15 cm x 7.5 cm x 3 cm slabs
to sell to grocery stores. At a minimum, how much foil is needed
to wrap all the slabs from the block?

Yours truly,
Lilly Joseph
```

```
Date: 08/13/97 at 16:05:48
From: Doctor Rob
Subject: Re: Surface area block problem

There will be 20 blocks of cheese, by volume:

15*15*30/(15*7.5*3) = 20.

Each one will have two faces that are 15 by 7.5, two that are 15 by 3,
and two that are 7.5 by 3.  Add up the areas of these six rectangles
to get the surface area of one block. Multiply by 20 to get the total
surface area.

-Doctor Rob,  The Math Forum
Check out our web site!  http://mathforum.org/dr.math/
```
Associated Topics:
Middle School Geometry
Middle School Polyhedra
Middle School Two-Dimensional Geometry

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