Explain the pattern and provide the rules for the quantitative reasoning problems.

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.

There are two sets of rules, depending on the relationship between $B$ and $C$:

• Rule Set 1 (when $C = B - 10$):
  1. $A = B + 10$
  2. $C = B - 10$
  3. $D = 2B + 5$ (This can also be expressed as