Answer: A. 6.67 in
Step-by-step explanation:
Given : The aspect ratio of a rectangular shape is it's length divided by it's width (L/W).
Let 'l' be the length of the rectangular shaped chalkboard.
If the aspect ratio of a chalkboard is 4:3 and the width is 5 in then we have
[tex]\dfrac{l}{5}=\dfrac{4}{3}[/tex]
Multiply 5 on each side , we get
[tex]l=\dfrac{4}{3}\times5=6.6666666.....\approx6.67\text{ in.}[/tex]
Hence, the length of the chalkboard = 6.67 in.
