And this one makes the case that the answer is 201.
https://eowynsedcstuff.wordpress.co...problem-the-answer-is-neither-40-nor-96/Which reinforces my comment that one has to make many assumptions for a poorly written math problem.
This is an interesting comment from the author that came up with the 201 in comment section.
"P.S.: of course I’m speaking a bit tongue in cheek here, since 19 as an answer, even though a mathematically correct solution to the fourth line, would be more a destruction of the riddle than its solution, implying that lines two and three are wrong and the entire thing is rather a hoax or psychological test than a mathematical riddle that actually makes sense.
Though I agree with you that theoretically other solutions are possible, I still haven’t seen a solution other than 201 which is both mathematically correct and leaves the riddle intact."