My brother showed me the following puzzle from some type of (IQ?) quiz game on his phone:
1 + 2 = 21
2 + 3 = 36
3 + 4 = 43
4 + 5 = ??
I am quite sure this was the original question asked.
I pondered it for a while and had a few guesses, but none were accepted as "Correct."
I also tried to search on google for it in various ways, but got nowhere.