Answer:
The pipe was leaking at 1.6875 Gallons Per Day
Explanation:
We have 9 fl oz/hour
and we need to convert it to gallons per day
So we need two conversions:
1. fl oz to gallons
2. hours to day
For #1, we know 1 fl oz = 0.0078125 gallons
So 9 fl oz would be 0.0078125 * 9 = 0.0703 gallons
Also there are 24 hours in a day.
Now, we can setup a ratio and multiply by the respective conversion factors to get our answer. Shown below:

So, that is 1.6875 Gallons Per Day