Problems

Here you may find some math & science problems. The problems here are sort of familiar to STEM high school-style questions but are rather more general-audience oriented. Some questions merely require common sense, while others may be a bit challenging to people with no post-preparatory school STEM education. Regardless, a level of difficulty is assigned to each question based on the following criteria:
- Level I - mere common sense is enough to solve the question
- Level II - A minimum familiarity with some topics is needed
- Level III - Challenging
These categories are measured, physics-style, with respect to an inertial reference frame; i.e. myself (currently rating the questions while lying on my bed).
I shall post a new question whenever I stumble upon a one I deem worth sharing.
Enjoy!