How many pictures does a camera with 8.1 mp hold?

Answer 1

There is no way to tell because you have not given any details about the camera.

8.1MP has nothing to do with how many pictures the camera can save, it all depends on the memory type and how much memory you have for the camera. It also depends on how you store - high or low res JPEGs, or RAW etc. The storage is in the memory device, SD card, CF card, Memory Stick etc, so its capacity, typically 1 or 2 gigabytes or more, has to be counted. In a 1 gigabyte card you could store from less than 100 to several thousand pics.