Answer:
8 personal training sessions
Explanation:
Simply add up the training session prices until they are equal;
Silver Gym: 25 + 25 + 25 = $75
Fit Factor: 15 + 15 + 15 + 15 + 15 = $75
So she needs to purchase 3 Silver Gym personal training sessions and 5 Fit Factor personal training sessions for the total cost at the two gyms to be equal.