In a supermarket, the first 25 customers of the day purchased an average of two items each.

After a further 15 customers, the average number of items purchased by each customer rose to eight.

What was the average number of items purchased by the last 15 customers only?

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?

 Closing date is 30th April 2011.

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: Q Rappoport, Kent and W Jones, Halesowen. The correct answer was: 132.