"88 K on a P" is a type of brainteaser puzzle called a letter equation. It means "88 Keys on a Piano".
Letter Equations are well known phrases or facts where the key words have been replaced with the first letter of that word. These are often in the form of an equation, which contain a number, an equal (=) sign and the rest of the obscured phrase or fact.
To expand your mind you need to learn new facts and develop new modes of thinking that will make the information that you already know more useful. Check out these puzzles and brain teasers to expand your mind shared by Scientificpsychic.com.