Answer:
10 visits
Step-by-step explanation:
Let's model the expressions:
Now set them to equal each other to find x, the number of visits
50 + 2x = 30 + 4x Subtract 2x
50 = 30 + 2x Subtract 30
20 = 2x Divide by 2
10 = x
After 10 visits to the gym, the cost will be the same.