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Mensa Prize Puzzle Competition - December 2019

Question: 

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?

Answer: 

Six.

Closing Date: 
Tuesday, December 31, 2019
Show Answer On: 
Wednesday, January 1, 2020