Answer:
x = 40
Step-by-step explanation:
x + 100 + x = 180 {Straight line angles}
2x + 100 = 180 {subtract 100 from both sides}
2x = 180 - 100
2x = 80 {Divide both sides by 2)
x = 80/2
x = 40
They rented 18 altogether, it says it in the problem. to find the total bill however
18 x 225
(amount of cabins) x (price each)
18x225
4,050$