If Billy is a student or a scientist, then Billy is a student and a kid.
No kid loves the Opera. All adults love the Opera. If someone is a scientist, then they are an adult. Some students are kids. Billy is a kid.
∀x (Kid(x) → ¬OperaLover(x)) ∀x (Adult(x) → OperaLover(x)) ∀x (Scientist(x) → Adult(x)) ∃x (Student(x) ∧ Kid(x)) Kid(billy)