The number in each circle in the number pyramid is the sum of the two numbers just below it. Few of the numbers in a number pyramid are filled in. Find the number in the position marked "?".

In a standard mathematical addition pyramid, every brick or circle represents the direct sum of the two adjacent circles resting immediately underneath it. Based on the solved puzzle layout featured within this specific past paper selection, tracking the given arithmetic values through a step-by-step bottom-up matrix formulation reveals that the missing value marked by the question mark is exactly 5.