1. The first digit in the room numbers in an office block indicates the floor the room is on. For example, Room 503 is on the 5 th floor. a) On which floor is Room 615 ? b) There are stairs that take you from one floor to another. Between the floors, there are 2 flights of stairs. How many flights of stairs do you walk down if you go from Room 408 to Room 112? (2)

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**1.**

**a) On which floor is Room 615?**

- **Answer:** Room 615 is on the **6th floor**.  
  *(The first digit "6" indicates the 6th floor.)*

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**b) How many flights of stairs do you walk down if you go from Room 408 to Room 112?**

- **Answer:**  
  - **Room 408** is on the **4th floor**.
  - **Room 112** is on the **1st floor**.
  
  You are moving down **3 floors** (from 4th to 1st).  
  Since there are **2 flights of stairs between each floor**, you walk down:
  
  **3 floors × 2 flights per floor = 6 flights of stairs.**

**Total:** You walk down **6 flights of stairs**.
**1.** **a) Room 615 is on the 6th floor.** **b) Walking from Room 408 to Room 112 involves going down 6 flights of stairs.**

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