Average of first five multiples of 3 is

Options

A. 9
B. 11
C. 13
D. 15

Answer

To find the average of the first five multiples of 3, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the first five multiples of 3:**
The first five multiples of 3 are:
- 3 × 1 = 3
- 3 × 2 = 6
- 3 × 3 = 9
- 3 × 4 = 12
- 3 × 5 = 15

So, the first five multiples of 3 are: **3, 6, 9, 12, 15.**

2. **Calculate the sum of these multiples:**
Now, we need to find the sum of these numbers:
\[ 3 + 6 + 9 + 12 + 15 \]
Adding them together:
\[ 3 + 6 = 9 \\ 9 + 9 = 18 \\ 18 + 12 = 30 \\ 30 + 15 = 45 \]
Therefore, the sum is **45.**

3. **Count the number of multiples:**
We have identified that there are **5** multiples of 3.

4. **Calculate the average:**
The average is calculated by dividing the sum of the numbers by the count of the numbers:
\[ \text{Average} = \frac{\text{Sum of multiples}}{\text{Count of multiples}} = \frac{45}{5} \]
Performing the division:
\[ \frac{45}{5} = 9 \]
Thus, the average of the first five multiples of 3 is **9.**

### Final Answer:
The average of the first five multiples of 3 is **9.**

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