How many potatoes for mashed potatoes for 15 people
I use the "formula" of one potato each. A big one for me and a small one for each child.
Potatoes required for mashed potatoes for 15 people are around 9lbs. You can use all-purpose or chef's potatoes like Yukon Golds since they have medium starch and medium water.
I like to use one and half per person, leftovers make great potato soup. These are medium spuds