At a lumber company, shelves are sold in 3 types of wood, 2 different widths and 5 different lengths. How many different types of shelves could be ordered?

3 * 2 * 5 = 30

To find the number of different types of shelves that could be ordered, we need to multiply the number of options for each characteristic.

In this case, we have:
- 3 types of wood (let's say wood A, wood B, and wood C)
- 2 different widths (let's say width X and width Y)
- 5 different lengths (let's say length L1, L2, L3, L4, and L5)

To calculate the number of different types of shelves, we multiply the number of options for each characteristic: 3 types of wood * 2 different widths * 5 different lengths.

Thus, the number of different types of shelves that could be ordered is 3 * 2 * 5 = 30.

Therefore, there are 30 different types of shelves that could be ordered from this lumber company.

To find the number of different types of shelves that could be ordered, we need to consider the number of options for each characteristic (wood type, width, and length) and multiply them together.

1. Wood type: There are 3 types of wood. Let's denote them as A, B, and C.

2. Width: There are 2 different widths. Let's denote them as X and Y.

3. Length: There are 5 different lengths. Let's denote them as L1, L2, L3, L4, and L5.

To find the total number of different types of shelves, we multiply the number of options for each characteristic together:

Number of different types of shelves = Number of wood types * Number of widths * Number of lengths
= 3 * 2 * 5
= 30

Therefore, there could be 30 different types of shelves that could be ordered from the lumber company.