The sum of 8 numbers is 168. If one of the numbers is 28, what is the average of the other 7 numbers?

Answer

To solve the problem step by step, we will follow these instructions:

1. **Identify the total sum of the 8 numbers**: We are given that the sum of 8 numbers is 168.

2. **Identify the known number**: One of the numbers is given as 28.

3. **Calculate the sum of the other 7 numbers**: To find the sum of the other 7 numbers, we subtract the known number (28) from the total sum (168).
\[ \text{Sum of other 7 numbers} = \text{Total sum} - \text{Known number} = 168 - 28 = 140 \]

4. **Calculate the average of the other 7 numbers**: The average is calculated by dividing the sum of the other 7 numbers by the number of those numbers (which is 7).
\[ \text{Average} = \frac{\text{Sum of other 7 numbers}}{\text{Number of other numbers}} = \frac{140}{7} = 20 \]

5. **State the final answer**: The average of the other 7 numbers is 20.

### Summary of Steps:
1. Identify total sum of 8 numbers (168).
2. Identify the known number (28).
3. Calculate the sum of the other 7 numbers (140).
4. Calculate the average of the other 7 numbers (20).
5. State the final answer.