Clinical perspective, offered as context rather than as advice. The useful move here is to separate what is established from what is widely repeated. Those two sets overlap less than the confident tone of most write-ups suggests, and the second set is where nearly all the disagreement on this board comes from.
Adding the clinical framing, because it changes how the question reads. Take it one variable at a time. Almost every unanswerable question in these threads is unanswerable because three things changed in the same fortnight, and no amount of subsequent argument can untangle them after the fact.
Correct me if the detail matters more than I have assumed.
pete_nash said:Almost every unanswerable question in these threads is unanswerable because three things changed in the same fortnight, and no amount of subsequent…
Same pattern here, and in the same order.
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Shop Reference Standardspete_nash said:Almost every unanswerable question in these threads is unanswerable because three things changed in the same fortnight, and no amount of subsequent…
There is a second half to this that has not been said yet. Whatever the answer turns out to be, the method for getting there is the same: state the assumption, do the arithmetic in public, and invite the correction. That is slower than asserting, and it is the only version that survives being wrong.