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Puzzle Games

Mensa Prize Puzzle Competition - December 2019

Enter this month’s competition for a chance to win a set of Mensa branded Absolutely Authentic Mensa test cards. A must for anyone who enjoys testing their logical thought process to the limit! For a chance of winning, submit your answer to the following question. We will pick two correct entries after the closing date.

Closing Date: 31st December 2019

In a toy store, the first 20 customers purchased an average of three presents each.

After a further 40 customers the average number of presents purchased rose to five.

What was the average number of presents purchased by the last 40 customers only?

Show Answer

Six.