The product of two numbers is 231 and one number is 21. What is the second number?

Options

A. 31
B. 7
C. 11
D. 21

Answer

To find the second number when the product of two numbers is given, we can follow these steps:

### Step 1: Understand the problem
We know that the product of two numbers is 231, and one of the numbers is 21. We need to find the second number.

### Step 2: Set up the equation
Let the second number be represented by \( x \). According to the problem, we can write the equation:
\[ 21 \times x = 231 \]

### Step 3: Solve for \( x \)
To find \( x \), we need to isolate it on one side of the equation. We can do this by dividing both sides of the equation by 21:
\[ x = \frac{231}{21} \]

### Step 4: Perform the division
Now, we will calculate \( \frac{231}{21} \):
\[ x = 11 \]

### Step 5: Conclusion
The second number is \( 11 \).