Well, I can tell you Johnny has memory cards in his pocket.
My brother, Johnny, is a tech nerd. He loves gadgets of all kinds. As a matter of fact, you can be sure at any one given time, he will have SOME sort of tech related thing in his pockets.
That being said...
Johnny-Gadget says to our other brother, Mickey, "Can you figure out how many memory cards I have in my pockets?"
He then gives Mickey three clues:
1. If the number of memory cards I have is a multiple of 5, it is a number between 1 and 19.
2. If the number of memory cards I have is not a multiple of 8, it is a number between 20 and 29.
3. If the number of memory cards I have is not a multiple of 10, it is a number between 30 and 39.