Question

explain what another way to weigh an elephant

Answer 1

umm.....
with a big scale

Answer 2

put it in a deep swimming pool and measure how much the water rises...

Answer 3

If you want to get Technical about it.

Answer 4

what way do you already have

Answer 5

Well, to weigh an elephant... you could do what @orion92898 said or Get a large scale :P

Answer 6

It could be done the same way they weigh whales. Get a crane, and a large, thick tarp, and lift the elephant in the tarp.