Find out about yourselfJoin Mensa nowBrowse our shop

Mensa Group

Were you previously a member? Rejoin


Are you a member of another National Mensa? Become a Guest member

Mensa Brainteasers

A recycling factory makes its own paper cups for canteen use.

It can make one cup from nine used ones.

If it has 961 used cups how many new ones can it possibly make?

25 Jun 2012