Answer:
Step-by-step explanation:
Let the number of fitness class is x.
For attending Universe fitness the cost for the whole year will be [tex]250 + 3.50x[/tex]
Silver gym will charge [tex]400 + 2x[/tex] in total.
Since, these costs are same
[tex]400 + 2x = 250 + 3.50x\\150 = 1.5x\\x = 100[/tex]
Hence, the desired number is 100.
For both gym the cost is same to attend 100 classes.
Hence we can calculate the cost from either of them.
The cost is [tex]400 + 2 \times100 = 600[/tex]