Maths Problem solving

For maths in problem solving we did a problem. Here is the problem and my solution.

Problem: You have gone to the store and bought a fox, a chicken and some corn. Now you are by the river. If you leave the corn with the chicken, the chicken will eat the corn. If you leave the chicken with the fox, the chicken's in big trouble. You have a boat but it can only take you and one other thing because if it has any more weight on board it will sink. How many trips in your boat can you make to get all three to the other side without the chicken eating the corn or the fox eating the chicken?

Solution: You take the chicken across first. This is trip 1. You come back with nothing. This is trip 2. You take the fox. This is trip 3. If you leave the chicken then it will get eaten so you take it back. This is trip 4. You take the corn across because otherwise the chicken will eat the corn. This is trip 5. You come back with nothing. This is trip 6. You take the chicken. This is trip 7. You have now taken everything!

I have done only one of the two ways of solving it. Comment on this if you figure out the other way.