Jon can skate for 5 hours.
Jon has to pay $9 for admission and $2 for skates for the first hour. This means so far he has paid $11. Now u have to add $2 for each hour that he skates. Remember, he only had $19 so u would stop adding $2 until u hit $19. After you keep adding $2 for every hour, you would end up with 5 hours.
Here is some work:
(1hr) 9+2=11
(2hr) 11+2=13
(3hr) 13+2=15
(4hr) 15+2=17
(5hr) 17+2=19
This means that Jon can skate for 5 hours if he has $19.
Hope this helped you understand!!
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