When Best Life first wrote about this deceiving question, we had to ask a mathematician to explain the answer!
Answer: 18.
Some people get stumped by the triangles hiding inside of the triangles and others forget to include the giant triangle housing all of the others. Either way, very few individuals—even math teachers—have been able to find the correct answer to this problem. And for more questions that will put your former education to the test, check out these 30 Questions You’d Need to Ace to Pass 6th Grade Geography.
