That doesn’t follow at all.
number of friends minimum bags
1 4
2 4
3 6
4 4
6 6
Hmm...if she is able to buy 4 bags or 6 bags, the store must sell them in packs of 2. So if she has only one or two friends, she could buy 2 bags of stickers and be done.
So she must have either 3, 4, or 6 friends.
I’m inclined to eliminate 6 friends too. If she had 6 friends, she wouldn’t consider buying 4 bags of stickers.
By the same reasoning, if she had 4 friends, she would know to buy 4 bags of stickers.
I’m guessing that she has 3 friends, and the answer they’re looking for is 6 bags. But as you see this takes a couple of huge assumptions.
3 Friends, 4 bags does not work even if the stickers are sold two to a bag.
While Mythbusters proved you can polish a turd, nobody can polish this one.