500
Problem Solving Skills:
a man has to get a fox, a chicken, and a sack of corn across a river. He has a rowboat, and it can only carry him and on other thing. If the fox and the chicken are left together, the fox will eat the chicken. If the chicken and the corn are left together, the chicken will eat the corn. How does the man do it?
Take the chicken across first
take the fox second but bring the chicken back
take the grain across then come back for the chicken