Study guides › Level 10 · Grandmaster

River crossings

Level 10 · for questions like “A farmer must take a fox, a goose and a bag of beans across a river.”

💡 The idea

Some things can’t be left alone together. The trick is that the farmer may bring something back.

🪜 The steps

1. Find the thing that clashes with both others: it must go first.
2. Take the others across one by one.
3. When a clash would happen, bring the troublemaker back.
4. Count every trip, there and back.

⚠️ Watch out

• Trips across and back are both crossings.
• With a bigger boat, look for a shortcut.

🎯 Try these

1. Fox, goose, beans; the boat holds one thing. How many crossings?

Answers: 1) 7

This guide is also in the 10LogicQ app: tap “📖 Study guide” after a puzzle.