They don't even keep out low skilled workers as they don't need much IQ, at least for a worker who is repeatedly solving them and was thought the best approach

They don't even keep out low skilled workers as they don't need much IQ, at least for a worker who is repeatedly solving them and was thought the best approach to do so. What they keep out is people with Discalculia, which are in no way stupid or low IQ, just can't to math well. (They also would probably be able to do it, but probably take to long and/or get offended enough to not do it).