Actually, I think 10 is the most common not only in Germany, but about everywhere. There are usually several sizes, I sure saw 6, 10, 12 & 18, but I guess 10 eg

Actually, I think 10 is the most common not only in Germany, but about everywhere. There are usually several sizes, I sure saw 6, 10, 12 & 18, but I guess 10 eggs is the most common wherever I tried to buy eggs. I didn't really pay close attention, though.