You may have had the great fortune to bump into this Question.
First of all it wasn’t written by a 12 year old genius or meant for regular students. In fact it is “actually a question from the Sec 3 and from the Sec 4 SASMO (Singapore and Asian Schools Math Olympiad) contests held on Apr 8, 2015 (see photo below). Being Q24 out of 25 questions, this is a difficult question meant to sift out the better students. SASMO contests target the top 40% of the student population and the standards of most questions are just high enough to stretch the students.”
With that in mind I decided to create one that was more appropriate for everyday use.