Problem 4 · 2013 Math Kangaroo
Easy
Spatial & Visual Reasoning
path-tracing
Nick can turn right but not left on his bicycle. What is the least number of right turns he must make to get from A to B?
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Answer: B — 4
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Hint 1 of 3
Put your finger at A and try to drive to B, only ever turning right.
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Hint 2 of 3
Each right turn changes the direction you face by a quarter-turn; count just the turns.
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Hint 3 of 3
Hunt for the route that reaches B making as few right turns as you can.
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Approach: trace the right‑only route through the maze
- Start at A and follow the streets, allowed to go straight or turn right but never left.
- Trying the routes, the one that reaches B with the fewest turns needs 4 right turns.
- So the least number of right turns is 4, choice B.
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