@IrisaMasino Think of it more like "if a student mastered logic, they saw improvements." Mastering logic is SUFFICIENT for an improved score. They did not say ONLY the students who mastered logic saw improvements, so it is not necessary. Maybe other students saw improvements by practicing comprehension or speed, or for example!

Tiger: Not all art classes are easy. After all, Art 3000 is advanced and teaches hard-to-grasp concepts.

Disney: Gym goers can now access the sauna for free with a pin. If you have attended the gym for 4 months, the pin is given to you. All others must do a training course for the pin. Brad is a gym goer who has the pin for the sauna but he has not attended the gym for 4 months. Thus, he must have completed the training course.

Trash Bin: My homework had crayon marks all over it. The marks were scribbles. My baby brother was holding a crayon scribbling on the wall. My hypothesis is that he was the one who scribbled on my homework.