How to find the length of an edge of a prism - GRE Quantitative Reasoning

The surface area of a rectangular prism with sides , , and is given as:

.

Two sides are known; it does not matter how they are designated, but for this problem let and , with as the unknown side. This yields equality:

Now that the three dimensions are known, it's possible to calculate the volume:

The surface area of a rectangular prism with sides , , and is given as:

.

Two sides are known; it does not matter how they are designated, but for this problem let and , with as the unknown side. This yields equality:

Now that the three dimensions are known, it's possible to calculate the volume:

The surface area of a rectangular prism with sides , , and is given as:

.

Two sides are known; it does not matter how they are designated, but for this problem let and , with as the unknown side. This yields equality:

Now that the three dimensions are known, it's possible to calculate the volume:

The surface area of a rectangular prism with sides , , and is given as:

.

Two sides are known; it does not matter how they are designated, but for this problem let and , with as the unknown side. This yields equality:

Now that the three dimensions are known, it's possible to calculate the volume:

The surface area of a rectangular prism with sides , , and is given as:

.

Two sides are known; it does not matter how they are designated, but for this problem let and , with as the unknown side. This yields equality:

Now that the three dimensions are known, it's possible to calculate the volume:

The surface area of a rectangular prism with sides , , and is given as:

.

Two sides are known; it does not matter how they are designated, but for this problem let and , with as the unknown side. This yields equality:

Now that the three dimensions are known, it's possible to calculate the volume:

The surface area of a rectangular prism with sides , , and is given as:

.

Two sides are known; it does not matter how they are designated, but for this problem let and , with as the unknown side. This yields equality:

Now that the three dimensions are known, it's possible to calculate the volume:

The surface area of a rectangular prism with sides , , and is given as:

.

Two sides are known; it does not matter how they are designated, but for this problem let and , with as the unknown side. This yields equality:

Now that the three dimensions are known, it's possible to calculate the volume: