There’s this math puzzle doing the rounds on Facebook. Perhaps you’ve seen it.
It usually starts with the statement that only geniuses can solve it or that ninety percent of people get it wrong. Then the following:
If: 2 = 6 3 = 12 4 = 20 5 = 30 6 = 42 Then: 9 = ?
Quickly see if you can work out the answer. Write it down on a piece of paper, then click on Page 2 below: