Of all Critical Reasoning Question Types on the GMAT® , the Inference question is probably the easiest one after the Conclusion Type. The easiest inference questions are like Chemistry experiments, if green fumes come out it must contain ammonia (or whatever is green). Let us look at the question below: A company’s two divisions performed with remarkable consistency over the past three years: in each of those years, the pharmaceuticals division has accounted for roughly 20 percent of dollar sales and 40 percent of profits, and the chemicals division for the balance.