Question 117
In the equalities below, each letter represents a digit: $$
AB + BC = CD \quad \text{ and } \quad AB - BC = BA
$$ How much is $A+B+C+D$ worth?
AB + BC = CD \quad \text{ and } \quad AB - BC = BA
$$ How much is $A+B+C+D$ worth?
MathNet 2026 — Part 02 Question 117
Math Olympiad Vault · MathNet 2026 — Part 02