this guy HAS to be riding the short bus

The answer is 15 btw.

(4x4) - (4/4)

(16) - (1)

= 15

It's 15, using BIDMAS/BODMAS

It's just engagement bait to get people to click and comment so that the algorithm shows his stuff to more people. It's kind of like those ones where people put a picture side by side with an almost identical picture, and then tell you to spot the five differences, but there are only four. Or two identical pictures and they tell you the spot the difference, but there isn't one. It's all just used to get people to click and comment.

The question is ambiguous because it uses the ÷ symbol instead of correctly writing it as a fraction

So all the answers could be correct, depending on how you interpret the question