How many African elephants weighs the same as a Boeing 747?

This depends on whether the 747 is full of fuel or not since a Boeing 747 weighs approximately twice as much when it is full as when it is empty! Given that an African elephant can weigh around 7 tons (the biggest up to 12 tons), and a Jumbo Jet is around 200 tons empty and 400 tons, when full of fuel - the answer lies somewhere in the region of 28 (empty) to 56 (full).