Farmer has to transport a fox, a chicken, and a sack of corn across a river. she can carry only one item at a time. if left together, the fox will eat the chicken, and the chicken will eat the corn. how does the farmer do it?

Step by step guide

1) carry the chicken over and put it there

2) farmer cross alone to carry the corn over and carry the chicken back

3) put the chicken there and carry the fox to put there with th3 corn

4) go back to get the chicken