How many Yukon gold potatoes are equivalent to 3 pounds?
I think the size of Yukon gold potato determines the pound equivalence. These types of potatoes have yellow tingled flesh and were developed in 1960. Visit http://en.wikipedia.org/wiki/Yukon_Gold_potato to learn more about them.
Depends on how big they are. Try putting them on your bathroom scale until it reads 3 pounds.
Best to weigh them but I would expect 15-20 Yukon Gold potatoes would be about right since they tend te be rather small.