> as the concrete used for weight here would be less than the amount used for a dam Think that through. A dam probably holds 100 or 1000 tons of water for eve

> as the concrete used for weight here would be less than the amount used for a dam Think that through. A dam probably holds 100 or 1000 tons of water for every ton of dam material. A concrete weight holds exactly on ton of concrete for one ton of concrete weight material. And "amount of weight helt", be it water or concrete, is Exactly what matters here.