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?

6/6/26 – Fenced Off

A farmer wants to build a 50m electric fence.

He places posts at every metre and puts electric wiring between them.

If 5 people can erect all the posts in 3 hours and 24 minutes, how long will it take for 12 people to install the posts?

Puzzle courtesy of Mensa member Peter Hooton

  • Show Answer

Answer = 1 hr 25 minutes

To make a fence of 50m takes 51 posts

5 people take 3 hrs 24 mins (= total of 204 x 5 = 1020 mins)

1020 ÷ 12 = 85 minutes = 1 hr 25 minutes

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