How many rolls of wallpaper should I buy?

A family decided to hang new wallpaper, but they don't know how many rolls to buy. The wife suggested to ask the neighbors from the second floor because their apartments are of the same size and she knew they have hung new wallpaper recently. So, the husband goes to the neighbors:
HUSBAND: How many rolls of wallpaper did you buy?
NEIGHBOURS: 16 rolls
So the husband bought 16 rolls, hung them and it appeared that there were extra 6 rolls left. He goes to the neighbors again:
HUSBAND: What's wrong with you, guys?! There are 6 rolls left!
NEIGHBOURS: Yes, we had 6 rolls left as well.

Have fun in Ukraine!

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