Monthly Archives: September 2014


At the optician, I saw several spectacles for sale. The prices of the frames, still without the glasses, showed a very clear pattern.

Pattern code glasses

What is the price of the one labelled with the question marks?

Usually you can find a new braintease here usually on Friday. Solutions are generally provided one week later.

You can check your solution here

The two sisters

Here is another age problem:

On a question about her age, Alice replied:
Me, I’m very old. I’m even older than my sis Barbara and I were together 7 years ago. And though Barbara is just two years younger than I am, she is still very young: she even isnt as old as we were together seven years ago!

What is the age of the girls?

You can check your solution here