Assume you are using a basic calculator

and press the numbers in the order shown,

replacing each question mark with a mathematical sign.

Plus, minus, multiply and divide

can each be used once only.

3    ?    5    ?    4    ?    8    ?    9    =

What is the lowest number you can possibly score?. 

For a chance to win one of two Mensa Brain Trainer hand held consoles, simply e-mail the correct answer together with your full name and address to the Puzzle Editor or please e-mail: puzzles@mensa.org.uk

Curious About Your IQ?

Train Your Brain?

If you like puzzles, you will love the 2011 Mensa Calendar Challenger! Last year's best seller is back featuring 365 brand new puzzles - one a day! Click here for more details

Closing date is 30th November 2010.

The first two correct entries selected will be declared the winners and will be notified by the competition judges. The judge's decision is final; no correspondence will be entered into. Congratulations to last month's winners: M Joseph, Oxfordshire and A Redmond, Bristol. The correct answer was 65.