In each of the following questions, find the exact value of (?)
`15 div 5 xx 4 - 2 = ? - 9`

Options

A. 23
B. 19
C. 17
D. 15

Answer

To solve the equation \( 15 \div 5 \times 4 - 2 = ? - 9 \), we will follow the order of operations, often remembered by the acronym BODMAS (Brackets, Orders, Division and Multiplication, Addition and Subtraction).

### Step-by-Step Solution:

1. **Identify the operations**: The expression on the left side is \( 15 \div 5 \times 4 - 2 \). We will perform the division and multiplication first.

2. **Perform the division**:
\[ 15 \div 5 = 3 \]
Now, we can rewrite the expression:
\[ 3 \times 4 - 2 = ? - 9 \]

3. **Perform the multiplication**:
\[ 3 \times 4 = 12 \]
Now, the expression becomes:
\[ 12 - 2 = ? - 9 \]

4. **Perform the subtraction**:
\[ 12 - 2 = 10 \]
Now, we have:
\[ 10 = ? - 9 \]

5. **Isolate the question mark**:
To find \( ? \), we add 9 to both sides:
\[ 10 + 9 = ? \]
Thus:
\[ ? = 19 \]

### Final Answer:
The exact value of \( ? \) is \( 19 \).