Answer:
The farmer has to make 7 crossings to get everything across safely.
Step-by-step explanation:
This is how the farmer must get everything across:
- The farmer takes the chicken to the far side and leaves him there.
- The farmer returns in an empty boat and collects the grain.
- Travelling again to the far side he deposits the grain & picks up the chicken to return to the near side.
- At the near side he deposits the chicken and collects the fox.
- At the far side he leaves the fox and grain together.
- He returns with an empty boat and collects the chicken.
- He travels to the far side with himself and the chicken.
This makes 7 crossings total.
Hope it helps!