The discussion revolves around a logic problem involving a four-digit number represented as ABCD and another number CDAB. The relationship between these numbers is defined by the equation 2 × (ABCD) = CDAB - 5. Participants are attempting to determine the values of A, B, C, and D based on this equation.
The discussion is ongoing, with various approaches being explored. Some participants have provided guidance on how to reformulate the problem, while others are questioning the nature of the solutions and the methods used. There is no explicit consensus on the best approach yet.
Participants note the constraints of the problem, including the requirement for A, B, C, and D to be digits and the implications of the equation leading to potentially infinite integer solutions. There is also a reference to a similar previous thread, indicating a shared context in problem-solving approaches.
Notice that AB and CD always appear together. I would do it this way:mhill said:Homework Statement
given a number of four ciphers ABCD and another four cipher number CDAB get the values of A,B,C,D if we know that 2x (ABCD)=CDAB-5
Homework Equations
2X (ABCD)=CDAB-5
The Attempt at a Solution
no idea.. i have try by brute force but got no results only incongruences , for example B=-3 or similar here '2 x' means multiplication