Explain the quantitative reasoning pattern based on the provided rules and derived formula.

Here are the solutions to the quantitative reasoning problems:

The pattern for these problems is as follows:
Let $A$ be the number in the top square.
Let $B$ be the number in the left triangle.
Let $C$ be the number in the right triangle.
Let $D$ be the number in the end square.

The rules are:

1. $A = B + 10$
2. $C = B - 10$
3. $D = 2B + 5$ (This is derived from $D = B + C + 15$, substituting $C = B - 10$ gives $D = B + (B - 10) + 15 = 2B + 5