Find the missing numbers.
18, 21, 24, 27, ...

Options

A. 32
B. 30
C. 31
D. 29

Explanation

To find the missing numbers in the series 18, 21, 24, 27, we can follow these steps:

### Step 1: Identify the pattern in the series
We start with the first number, which is 18.

### Step 2: Calculate the difference between consecutive numbers
- From 18 to 21, the difference is:
\[ 21 - 18 = 3 \]
- From 21 to 24, the difference is:
\[ 24 - 21 = 3 \]
- From 24 to 27, the difference is:
\[ 27 - 24 = 3 \]

### Step 3: Confirm the pattern
We can see that the difference between each pair of consecutive numbers is consistently 3. This means that the series is increasing by 3 each time.

### Step 4: Find the next number in the series
To find the next number after 27, we add 3 to 27:
\[ 27 + 3 = 30 \]

### Conclusion
The next number in the series is 30.