# Problem of the Week Problem E Just an Average Sum

Faisal chooses four numbers. When each number is added to the mean (average) of the other three, the following sums are obtained: $$25$$, $$37$$, $$43$$, and $$51$$.

Determine the mean of the four numbers Faisal chose.

Extra Problem: Can you interpret the following picture puzzle? You may need to research the meanings of some mathematical symbols used in the puzzle.