How many photos in 56MB Internal memory

[Tuvoc]

For something like a Sony Cyber-shot W55 7MP Digital Camera, how many photos roughly would fit into the 56MB internal memory ?

I'm very new to digital cameras, looking at what to buy now
Clearly I need a memory stick, but would like to know how many the internal memory holds

cheers

 

[ChroniC]

About 20
files size roughly of about 2.5mb an image.

 

[Tuvoc]

Great, thanks !