Study guides › Level 6 · Master

Age puzzles

Level 6 · for questions like “Ana is 3 years older than Ben. In 2 years Ben will be 10. How old is Ana now?”

💡 The idea

Ages move together: every year, everyone gets one year older. So the gap between two people never changes.

🪜 The steps

1. Find one person’s age now. Undo any “in 2 years” or “3 years ago” first.
2. Use the gap or the “twice as old” to find the other age now.
3. Only then move forward or back in time, if the question asks.

⚠️ Watch out

• Twice as old is about one moment. If A is twice as old as B now, A won’t be twice as old in 5 years.
• “Add up to” puzzles: take away the gap, then halve.

🎯 Try these

1. Lee is 4 years older than Kim. In 3 years Kim will be 11. How old is Lee now?
2. Two ages add up to 20. One is 6 years older. How old is the younger one?

Answers: 1) 12 (Kim is 8 now) 2) 7

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