About how many games will I be able to get for the Xbox 360 4gb console?

I am going to be getting an Xbox 360 slim 4gb for Christmas this year. I heard that with 4gb thats not enough memory for a whole lot. But Im not really a hardcore gamer and I wont be downloading any videos, music, games or any other stuff onto the xbox. I just want the xbox so I can play games on it. I will be buying all my games in stores, but I also heard that you can buy them online and have them installed onto the system memory (which I wont be doing) I think? I dont really know to much about this stuff since I havnt really owned a game system in a long time. So about how many games will I be able to get for the 4gb xbox 360 before i will run out of memory on it? Im already getting Halo for it and I might get a few others for it too? I dont think I will ever get more than 20 games for it though, but If I ever did get that many games would I still have enough memory to save my games (Lets say I have 20 games and 1 save file on each game, is 4gb enough)?
Answer:

4g is easily enough to hold your save data but like you said you wont have much room to put anything else on there. if you really need more space you can plug a usb into your xbox and use that.

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