Can you answer this seemingly simple algebra question?
The image has been shared and liked by more than 70,000 Facebook users and has attracted a whopping 480,000 comments.
![The maths question that has been causing debate online. Photo / Facebook](https://www.nzherald.co.nz/resizer/v2/M5TUEP3JKLQ3SAGXIMMRIGKWDI.jpg?auth=abeef82e78762943ef987d7a22fe0e625b287fa88a8c5b18bea23942909bf779&width=16&height=16&quality=70&smart=true)
"Concentrate because this is tricky - the correct answer is?" the post asks.
Answers have ranged from 22, 23, 44, 48 and 21.