Question

John needs to cross a river with a chicken, a fox, and a corn. His boat allows himself and only one other item. He cannot leave the fox alone with the chicken and neither can he leave the chicken with the corn since the former eats the latter. How many times does he touch the shores?

• A. 3
• B. 5
• C. 7
• D. 9

Answer 1

The correct option is C 7

1st pair of trips: Take the chicken across, return.

2nd pair of trips: Take the fox across, return with chicken.

3rd pair of trips: Take the corn across, return.

Last trip: Take the chicken across.
2 + 2 + 2 + 1 = 7