Ring-porous woods, such as oak, are characterized by grains. The dark grains consist of very low-density material that forms early in the springtime. The surrounding lighter-colored wood is composed of high density material that forms slowly throughout most of the growing season.

Assuming the low-density material is highly porous and the oak is dry, determine the fraction of the oak cross section that appears as being grained.

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Wood grain (low-density) High-density material