Answer: 19 paddle boards were rented.
Explanation:
Let x represent the number of surfboards that were rented.
Let y represent the number of paddleboards that were rented.
A total of 44 surfboards and paddleboards were rented. It means that
x + y = 44
For a two day rental at the surf shop, it cost $45 to rent a surfboard and $60 to rent a paddleboard.
The total cost of surfboards and paddleboards rented was $2265. This means that
45x + 60y = 2265 - - - - - - - - - 1
Substituting x = 44 - y into equation 1, it becomes
45(44 - y) + 60y = 2265
1980 - 45y + 60y = 2265
- 45y + 60y = 2265 - 1980
15y = 285
y = 285/15 = 19
x = 44 - y = 44 - 19
x = 25