Answer:
4
Explanation:
x is defined as in how many exhibits you go to
For Zippy Zoo: 18+2.5x
For Happy Zoo: 7+5.25x
We want zippy zoo=happy zoo so 18+2.5x=7+5.25x
this is now a 1 variable linear equation that we can solve
18+2.5x=7+5.25x
11=2.75x
x=11/2.75
x=4
Hope this helps!
Ben