35 tonnes - the weight of the largest sarsen stones (the uprights of the Great Trilithon).
20 tonnes - the average weight of the sarsen circle uprights.
3 tonnes - the weight of the largest bluestones.
40 tonnes - the estimated weight of the heel stone.
12 - the estimated minimum number of days it would have taken to drag a sarsen from the Marlborough Downs.
200 - the estimated number of people it would take to drag a sarsen stone on a simple wooden sled.
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