Four numbers in ascending order are w, x, y and z. The average of the smallest three is 25.5, and the average of the largest three is 29.5. What is the range of the data?

1. Smallest three: w + x + y = 3 × 25.5 = 76.5. 2. Largest three: x + y + z = 3 × 29.5 = 88.5. 3. Subtract: z - w = 88.5 - 76.5 = 12. 4. Range = largest - smallest = z - w = 12. _Source: RRB Group D CEN-02/2018 PYQ, Q.44._