Answer:
Jeff's picnic will cost $95.
Explanation:
First, you have to figure out the ratio. The picnic will cost $25 for 5 attendees, so if we divide both numbers by 5, we will find the cost if one person attends. 25 divided by 5 is 5, so our ratio is 1:5. Now, we have to multiply 19 and 5, which is 95, so Jeff's picnic will cost $95.