Final answer:
The gymnast practices 5 hours each day, calculated by dividing the total practice hours (120) by the total number of practice days over 4 weeks (24).
Step-by-step explanation:
To determine how many hours the gymnast practices a day, we need to divide the total hours she practices in a 4-week period by the total number of days she practices in those 4 weeks.
Given that she practices 6 days a week for 4 weeks, the total number of days she practices is 6 days/week × 4 weeks = 24 days.
Now, we divide the total hours by the number of practice days: $120 hours ÷ 24 days = 5 hours/day.
Therefore, the gymnast practices 5 hours each day.