A trip to Australia

What to do?

By Ethan and Andy

Jenn and Nate went to Australia for vacation. Jenn wants to go to a fancy hotel($40) and go to the boardwalk($10), but Nate wants to go on a safari($60), and eat some native cuisine($30). Which way is cheaper and why?
Jenn's way would be cheaper by $4, because I added up both of their ways by the amount of money spent.
One way to find this is out is by addition.

50+A= 90

You can also use subtraction

90-A=50