Plate should sufficiently feed 4 or 7. Just the size.
Plate size indicates either small or large so plate of 4 is a small size and feeds up to 4 adults and 7 is a large and feeds up to 7 adults.
If the name of food item is noted , then a number I.e. potato skins 7.... That means they are potato skins and it costs $7.00, but if it says, like the other answer, plate of, specifically, then it usually means enough for whatever they are serving. When in doubt, or if on a tight budget, ask your wait staff person quietly
which plate.?
Thanks! Your answer is awaiting moderation.