It depends on what apps you have open. Games will take up more RAM than apps so you will be able to keep less of them in the background.
I've managed to keep 21 apps whereas on iOS 6, I could only go as high as 18.
18 App ! ,, I can open only 3 apps on my iPod touch 5 {iOS 7.0.4} ,, is that normal ?
It depends on the apps
Facebook / Twitter / Photoes
if I open a 4th APP and go back to the Facebook it will restart :"-(
How can I fix the LOW RAM problem ??
18 App ! ,, I can open only 3 apps on my iPod touch 5 {iOS 7.0.4} ,, is that normal ?
I can keep 32 apps open in the backround on my 5c
If you just count the windows it's probably in the hundreds. Most of those apps have been pushed out of memory and are technically closed though.
It depends on what you are doing. You might be able to keep a couple of games open, or 20 note taking apps.
I'm still on a 4S but I found using the camera app and taking a picture nearly kills off all the apps that are in a suspended state.
How much apps can iPhone 5 handle in the BACKGROUND on iOS 7 ?