Kenneth wants to make a quilt out of orange and blue squares of fabric. He plans out the design so that the quilt is 9 pieces long and 12 pieces wide. Here is his sketch.

He sews 2 orange squares followed by 4 blue squares until the quilt is complete. How many blue squares does he need to complete the design?

1 answer

To determine how many blue squares Kenneth needs for his quilt, we first need to calculate the total number of squares in the quilt.

The dimensions of the quilt are:

  • Length: 9 pieces
  • Width: 12 pieces

The total number of squares in the quilt can be calculated as follows:

\[ \text{Total squares} = \text{Length} \times \text{Width} = 9 \times 12 = 108 \text{ squares} \]

Next, we analyze the pattern in which Kenneth sews his squares:

  • He uses 2 orange squares followed by 4 blue squares in a repeating pattern.

This pattern contains a total of:

\[ \text{Total squares in one pattern} = 2 \text{ (orange)} + 4 \text{ (blue)} = 6 \text{ squares} \]

Now, we need to find out how many complete patterns fit within the total of 108 squares:

\[ \text{Number of complete patterns} = \frac{\text{Total squares}}{\text{Squares per pattern}} = \frac{108}{6} = 18 \]

Now we can calculate the total number of blue squares. In each complete pattern, there are 4 blue squares. Thus, the total number of blue squares needed for the entire quilt is:

\[ \text{Total blue squares} = \text{Number of complete patterns} \times \text{Blue squares per pattern} = 18 \times 4 = 72 \]

Therefore, Kenneth needs 72 blue squares to complete the quilt design.

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