Answer:
[tex]x=48[/tex]
Step-by-step explanation:
Both triangles in this figure are similar, so we can set up the following proportions with their corresponding sides:
[tex]\frac{12}{15}=\frac{x}{60}[/tex].
Solving, we get:
[tex]15x=720,\\x=\fbox{$48$}[/tex].
