Puzzles

One activity that many of our members enjoy is puzzling! You can test yourself for fun with our brainteasers. Our quizzes and conundrums are updated regularly, so do check back on the page for the latest content, and if you get really good at them, why not find out what your IQ is by booking a Mensa Supervised IQ Test?

16-4-24

A Fibonacci sequence is one in which each term is derived by summing the previous two terms eg 1, 1, 2, 3, 5, 8, 13, 21

Complete these Fibonacci sequences then total the values in the circles.

Puzzle courtesy of Mensa member Peter Hooton

  • Show Answer

Sum of Circles = 29 (7 + 9 + 13)
Let the first circle = x. Then the 4th number in the first
sequence = (9 + x) and the 5th number = (18 + x).
Hence 18 + x + 9 + x = 41, x = 7.
A similar method can be used to find the other two
answers.

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