If (as US Presidential hopeful Ben Carson believes) the Pyramids in Egypt were built as grain storage silos, how do you suppose they filled and emptied them, and how long would a Pyramid full of grain last?

If (as US Presidential hopeful Ben Carson believes) the Pyramids in Egypt were built as grain storage silos, how do you suppose they filled and emptied them, and how long would a Pyramid full of grain last?
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Looking at this picture of the internals of the Khufu Pyramid, there is more volume in the passageways than in the chambers. Dimensions for the King’s Chamber that I found: about 10m x 5m x 6m = 300m³. Average mass per 100l of grain is an estimated average of 60kg, or 600kg per 1000l. So we are talking about 600kg per m³, meaning the King’s chamber can store, if fully filled, about 300×600kg=180000kg of grain. Average consumption of grain per person is about 70 kg per year. The estimated population size of Egypt at the time the Pyramid was built is 1.5 million So… 180000kg/(70kg/ax1500000)=0.00171428571a (a stands for year). or roughly a bit more than half a day. A fully filled King’s chamber would last for half a day. That is how ludicrous that idea is. And this is the belief of someone who wants to control the world’s largest nuclear arsenal.
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