Final answer:
It would take approximately 20.25 hours to fill the pool using 9 garden hoses.
Step-by-step explanation:
To find the answer, we can set up a proportion:
Number of hoses 1: 18 hours
Number of hoses 2: x hours
Using cross multiplication, we have:
8x = 18 * 9
x = 18 * 9 / 8 = 20.25
Therefore, it would take approximately 20.25 hours to fill the pool using 9 garden hoses.