This is actually more interesting as a psychology problem than a math problem.
Why do people see that someone clearly got two answers wrong, and then start coming up with all kinds of formulas to justify that error?
It shows how many people can’t figure out simple math. Just because someone did math wrong a couple of times before doesn’t mean you should too. 8+11 = 19
If I need a block cut on a job site and I it has to cover a full dimension 2x8 and then span 11 inches I am not going to be like. “A 40” block will fit, I will cut it at that.
Was the question find the progression? Nope. Do I see how the other answers work? Yes I do.
Go with the simple answer first. Make the person who wrote the question then explain the poorly worded question. Then explain to them how they are an idiot for not giving enough information on what they actually wanted. Why overthink crap?
