[tex]\text{Answer: }46\frac{2}{7}\text{ yards is needed to make 9 pillow covers.}[/tex]
Step-by-step explanation:
Since we have given that
Material needed to make a pillow cover is given by
[tex]5\frac{1}{7}\ yards=\frac{36}{7}\ yards[/tex]
We need to calculate the material which will be needed to make 9 pillows covers.
So, we use the "Multiplication Operation" as we need the value for more pillow covers :
[tex]9\times \frac{36}{7}\\\\=\frac{324}{7}\\\\=46\frac{2}{7}\ yards[/tex]
[tex]\text{Hence, }46\frac{2}{7}\text{ yards is needed to make 9 pillow covers.}[/tex]