Answer:
Explanation:
There are two different answers. I personally like the second one better but the expected answer is probably this:
- first take the goat, cross the river and leave the goat;
- return; take the bundle of grass to cross the river and leave the grass;
- take the goat back on the boat and then return;
- leave the goat, take the lion, cross the river and leave the lion;
- return one last time, take the goat, cross the river one final time.
Totally he has to make 7 one-way trip across or return the river.
A different answer is that the man can never take the lion across the river as he will get eaten by the lion half way across! :)