^^^ Or the fact that it's another lazy person writing purposefully misleading and possibly ambiguous math problems to show how "smart" they are in comparison to their internet friends.
The ones that got the answer 16 must have used their computers Microsoft standard calculator; enter 2+2*4 you get 16.
Using the scientific calculator entering 2+2*4 you get the correct answer 10. Using Microsoft scientific calculator entering 2+2*4 you get 10. Scary that someone needs a calculator to do this!