Maths And Murder

Riddle: On the first day of school, a principal was murdered. There are three suspects. The P.E Teacher was teaching his class, the math teacher was marking mid-term tests and the gardener was raking up some leaves. Who murdered the principal?

Answer: The math teacher. It was the first day of school. He wouldn't be marking mid-term reports. Source: https://riddles.com/10057

On the first day of school, a principal was murdered. There are three suspects. The P.E Teacher was teaching his class, the math teacher was marking mid-term tests and the gardener was raking up some leaves. Who murdered the principal? — Maths and Murder by Annabeth Riddle