Member for 9 years, 5 months
Last seen more than 3 years ago
On my Android 4.0.4 (ICS) Xperia ray, they are stored in /mnt/asec/XXX-1/pkg.apk. XXX is the Google Play ID of the application. For example, Firefox is found at /mnt/asec/org.mozilla.firefox-1/pkg.apk ...
System apps are found in /system/app/. The other apps you've installed are found in the /mnt/asec/ directory. See my answer to this question for details.