How many times should I go to the gym a week?

Question by Trenton: How many times should I go to the gym a week?
Okay here's the details:
ME:
Height: 164cm / 5' 4"
Age: 13
Weight: 56kg

Available days:
Monday: Swimming
Tuesday: Gym in PE
Wednesday: Gym at leisure centre.
Thursday: Gym at and after School
Friday: Rugby in PE, Gym at leisure centre.
Saturday: Gym at leisure centre.
Sunday: -

So those are all the available gym days and activities. I think I am a bit chubby and would like to lose weight, but also gain muscle, what

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