Thinking Skills
Liam, Macy and Niamh each have 20 coins. They take turns: even means give that many to each of the other two;…
Question 1 · Multiple choice
Question
Liam, Macy and Niamh each have 20 coins. They take turns: even means give that many to each of the other two; odd means receive that many from each. Liam spins 2. Macy spins 3. If they end with 12, 27 and 21, what did Niamh spin?
Options
- A. 1
- B. 2
- C. 3
- D. 4
Correct answer
A. 1
Explanation
After Liam 2 (even, gives 2): Liam 16, Macy 22, Niamh 22. After Macy 3 (odd, receives 3): Liam 13, Macy 28, Niamh 19. We need (12, 27, 21). Niamh must go from 19 to 21 (gain 2). Gaining 2 means she received 1 from each, so she spun a 1.