How do you weigh an elephant? ( Chinese riddle )

Answer 1

so you put the elephant in a boat, then you draw a line where the water reaches the boat. take out the elephant and put rocks into the boat until the water reaches exactly to the drawn line. you last add all the weights of the rocks you put in the boat. My father told me this riddle before. Plus I liked your question

Answer 2

drive your flatbed truck onto the truck scale and weigh it
load up the elephant onto the truck, and weight the truck+elephant.
Subtract.

Answer 3

:D Hello, thank you for your responses.