Earlier quoted context omitted.
IQ is a pretty arbitrary measurement, but I think a modern yankee in egypt would indeed have problem solving skills beyond their peers. Our education, formal and social, is quite a rapid process in the modern world and we basically give kids a free ride until around 18 so that they can focus on education rather than being forced to do menial labour. I think that as physical beings we're pretty similar to our ancient…
I don’t know the historical record for ancient Egypt, but I imagine we are way bigger and way smarter on average because of childhood nutrition and lack of parasites - see also, North Korea.
Ancient Egypt did have public schools and a semi-meritocratic scribe class so formal education was a thing which makes it easier to compare in contrast to areas that revolved entirely around apprenticeship like the more nomadic contemporaries would be.
Also, we do have a much more balanced diet growing up but if we did travel back to ancient Egypt there might be dietary issues trying to maintain our extra mass - the lack of access to diverse fruits and vegetables might wreck havoc on our bodies... you can look to extreme contemporary diets for any evidence of that you'd like to see.