### The DS Sufficiency Post-Mortem\n\nData Sufficiency measures logical efficiency, not computational endurance. When a question asks for 'the value of x', your goal is simply to establish if a unique value exists, not to find what that value is.\n\n#### The Anatomy of the Trap\nMany students find a statement insufficient because they did not carry out the calculations to get $x = 12$. They fail to see that having a single unique linear equation is sufficient in itself.