You stated in your first post
Try to solve it if you are smart
what would you do..to prevent that lion from eating you
Nothing in your post indicated that there was a "right" answer.
Smart people have responded with what
THEY would do, therefore the answers are
NOT wrong, and has been solved. Each person has solved it in a different way.
And I won't say what I would do because I'd be in a jungle where there were no lions and that situation simply would not happen.
On second thought, I wouldn't be in the jungle-I'd be at home, doing something wonderful like teaching a 2 year to potty train and learn colors and watching Handy Manny, Elmo, Wonder Pets, and Pooh with her. I'd be having a good time with her, laughing with her and at her when she does something funny while y'all are trying to figure a way out.
Now to reveal the answer. At least the answer I learned in 3rd or 4th grade when I first heard this.
Read what Boopme wrote, that has been the standard answer since then.