Solve the problem.

A shirt company has 4 designs that can be made with short or long sleeves. There are 5 color patterns available. How many different types of shirts are available from this company?

a. 9 types b. 40 types c. 11 types d. 20 types

B. 40

4 * 5 * 2 = ??

To find the total number of different types of shirts that can be made, you need to multiply the number of designs by the number of color patterns.

The number of designs is 4 (short or long sleeves).

The number of color patterns is 5.

Therefore, the total number of different types of shirts is 4 * 5 = 20 types.

So, the correct answer is option d. 20 types.

To find the number of different types of shirts available from this company, we need to multiply the number of options for each element of the shirts.

First, we have 2 choices for the type of sleeves: short or long.

Secondly, we have 5 choices for the color pattern of the shirt.

Since these choices can be made independently, we can multiply the number of choices for each element.

2 (sleeve options) x 5 (color pattern options) = 10 different types of shirts.

Therefore, the correct answer is not among the options provided.