A floor measures 12m by 8m. A rug covers one-third of the floor. The uncovered part of the floor forms a uniform (same width) strip around the rug. How wide is the strip?

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- Jul 22nd 2007, 01:25 PM #1

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- Jul 22nd 2007, 01:41 PM #2
Let be the width of the strip around the rug.

Note that the area of the floor is

If the rug covers 1/3 of the floor, it must have an area of

Since is the width of the strip:

The length of the rug is and the width is , and the area (found above) is

so we must have:

can you take it from here?

- Jul 22nd 2007, 01:51 PM #3

- Jul 22nd 2007, 02:02 PM #4

- Jul 22nd 2007, 02:21 PM #5