Click to ENLARGE, study & solve.
Full disclosure. I love mathematical puzzles like these. In my late teens & early 20s (way before there was an ‘online‘, never mind a Web) I used to buy IQ test books and do all the puzzles for fun. I still do them, though not that often anymore, albeit now on the Web. So, with this one I knew what I needed to be looking for.
Then I noticed something incongruous in a puzzle of this nature. There was a perfectly valid and obvious sequence for the numbers on the apex of the triangles: 2, 3, 4, 5 & 6.
But, I knew that that was TOO easy.
So, I worked out, quite quickly what the ‘pattern’ was. Pretty obvious from the first triangle. 8+3 = 11 & ’22’ is 11*2. Easy enough to validate that against the others.
So, as for the triangle in question. 8+9=17. 68÷17 –> –> wait for it. Wait for it. 68÷17= 4.
So, ‘4’ as “Reader’s Digest” confirms in their answers is the right answer. See image below.
So, could I have cheated and just used the easy 2, 3, 4, 5 & 6 sequence at the top without bothering to do all the sums (though it wasn’t hard)?
Hence why I wanted to share it with you.
What do YOU think?