To determine who spends less time doing homework per night, we can calculate the average number of hours spent per day for both Marco and Maribella.
Marco's Homework:
- For 3 days: \( \frac{3.25 \text{ hours}}{3 \text{ days}} = 1.08 \text{ hours/day} \)
- For 9 days: \( \frac{9.75 \text{ hours}}{9 \text{ days}} = 1.0833 \text{ hours/day} \)
- For 12 days: \( \frac{13.0 \text{ hours}}{12 \text{ days}} = 1.0833 \text{ hours/day} \)
- For 30 days: \( \frac{32.5 \text{ hours}}{30 \text{ days}} = 1.0833 \text{ hours/day} \)
Average for Marco: \( \frac{1.08 + 1.0833 + 1.0833 + 1.0833}{4} \approx 1.0825 \text{ hours/day} \)
Maribella's Homework:
- For 4 days: \( \frac{4.2 \text{ hours}}{4 \text{ days}} = 1.05 \text{ hours/day} \)
- For 8 days: \( \frac{8.4 \text{ hours}}{8 \text{ days}} = 1.05 \text{ hours/day} \)
- For 20 days: \( \frac{21.0 \text{ hours}}{20 \text{ days}} = 1.05 \text{ hours/day} \)
- For 28 days: \( \frac{29.4 \text{ hours}}{28 \text{ days}} = 1.05 \text{ hours/day} \)
Average for Maribella: \( \frac{1.05 + 1.05 + 1.05 + 1.05}{4} = 1.05 \text{ hours/day} \)
Now comparing the averages:
- Marco's average homework time is approximately 1.0825 hours/day.
- Maribella's average homework time is 1.05 hours/day.
Conclusion: Maribella spends less time on homework per night.
The correct statement is: Maribella spends less time on homework per night.
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