Answer: B. 3/4 inch
Step-by-step explanation:
Given: The width of each poster = 4 inches
Then the sum of width of 3 posters = \(3\times4=12\ inches\)
Let x be total width of the advertisement.
Since the ratio of the sum of the widths of the three pictures to the total width of the advertisement is 4:5.
Then, we have
\(\frac{12}{x}=\frac{4}{5}\\\\\Rightarrow\ x=\frac{12\times5}{4}\\\\\Rightarrow\ x=15\ inches\)
Now, the sum of lengths of empty spaces between the pictures
=Total width - sum of width of 3 posters\(=15-12=3\ inches\)
From the given picture, we have
\(\\\\\Rightarrow 4t=3\\\\\Rightarrow\ t=\frac{3}{4}\ inches\)
Hence, the length of each of the four empty spaces between the pictures = 3/4 inch.
