Simple looking equation stumps people - can you remember the 'special rule' to get right answer?

In grade school, you were constantly drilled on mathematics. But as an adult, those lessons all too often fall to the wayside. See if you can remember elementary formulas with this math problem.
IEEE

Reinforcement Learning for Solving Colored Traveling Salesman Problems: An Entropy-Insensitive Attention Approach

Abstract: The utilization of neural network models for solving combinatorial optimization problems (COPs) has gained significant attention in recent years and has demonstrated encouraging outcomes in ...
IEEE

Two-Level Battery Health Diagnosis Using Encoder–Decoder Framework and Gaussian Mixture Ensemble Learning Based on Relaxation Voltage

Abstract: Accurate diagnosis of the state-of-health (SOH) of the lithium-ion battery is crucial for its safe and reliable operation. In this article, a two-level battery health diagnosis model is ...