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

Week 8 - Monday 

A car has travelled 50 miles at 70 mph.

It started its journey with eight gallons of fuel but its tank has been leaking throughout the journey and is now dry.

The car completes 25 miles per gallon.

How many gallons of fuel does it leak per hour?

23 Feb 2017