For 1 I would set it up like this:
360 = 5q + 5n
For 2 I would put cost per mile because it's multiplied by the number of miles.
For 3 I would say the customers purchased 5 kid tickets and 4 adult tickets
For 4 I would do this:
P = each can of paint
and
B = each bush
25P + 12.75B = 327
For 5 I would say that 2 represents the amount of waffle cones and 3 represents the amount of milkshakes.
As always, I hope this helps!