Answer:
x=5
Step-by-step explanation:
3(2x-5) =15
6x-15=15
6x=15+15
6x= 30
6x/6=30/6
x=5
The number of people is extra information, all you need is 153.82*2 (for the trip and back) * .645, which I believe will be $198.43, but it might be best to check that math to be safe