To compare Gigi's earnings per hour for gardening and office work, we need to calculate her hourly rate for each type of work.
Gardening:
- Total earnings = $65
- Total hours = 5
Earnings per hour for gardening: \[ \text{Earnings per hour for gardening} = \frac{65}{5} = 13 \]
Office Work:
- Total earnings = $90
- Total hours = 9
Earnings per hour for office work: \[ \text{Earnings per hour for office work} = \frac{90}{9} = 10 \]
Now, we compare the two hourly rates:
- Earnings per hour for gardening = $13
- Earnings per hour for office work = $10
Next, we find the difference: \[ 13 - 10 = 3 \]
Gigi earned $3 more per hour for gardening than for office work.
Therefore, the correct statement is: She earned $3 more per hour for gardening than for office work.