The photo is 5 inches wide and 8 inches long.
If the length is enlarged from 8 inches to 12 inches, we can divide to get the scale factor.
[tex]\frac{12}{8}=1.5[/tex]Now, we multiply the width of 5 inches by the scale factor.
[tex]5\cdot1.5=7.5[/tex]Therefore, the enlarged width is 7.5 inches.
We do the same process. Let's divide to find the scale factor.
[tex]\frac{20}{8}=2.5[/tex]Now, we multiply to find the new width.
[tex]5\cdot2.5=12.5[/tex]Therefore, the enlarged width is 12.5.
Let's repeat the process.
[tex]\frac{10}{8}=1.25[/tex]Then, we multiply.
[tex]5\cdot1.25=6.25[/tex]Therefore, the enlarge width is 6.25 inches.