In the following equation, if the mathematical operators '-' and '`xx`' are interchanged then the value of `4-6 +1 xx 15 div 3` will be
A. 24
B. 20
C. -5
D. -4

Options

A. D
B. B
C. C
D. A

Answer

To solve the problem step by step, we need to follow the instructions given in the question regarding the interchange of mathematical operators. The original expression is:

**Original Expression:**
\[ 4 - 6 + 1 \times 15 \div 3 \]

### Step 1: Interchange Operators
We need to interchange the '-' (minus) and '×' (multiply) operators. Thus, the expression becomes:

**New Expression:**
\[ 4 \times 6 + 1 - 15 \div 3 \]

### Step 2: Apply BODMAS/BIDMAS Rules
According to the BODMAS/BIDMAS rules, we perform operations in the following order: Brackets, Orders (i.e., powers and roots, etc.), Division and Multiplication (from left to right), Addition and Subtraction (from left to right).

1. **Division:**
First, we perform the division \( 15 \div 3 \):
\[ 15 \div 3 = 5 \]

Now, the expression is:
\[ 4 \times 6 + 1 - 5 \]

2. **Multiplication:**
Next, we perform the multiplication \( 4 \times 6 \):
\[ 4 \times 6 = 24 \]

Now, the expression is:
\[ 24 + 1 - 5 \]

3. **Addition:**
Now, we perform the addition \( 24 + 1 \):
\[ 24 + 1 = 25 \]

Now, the expression is:
\[ 25 - 5 \]

4. **Subtraction:**
Finally, we perform the subtraction \( 25 - 5 \):
\[ 25 - 5 = 20 \]

### Final Answer
The value of the expression after interchanging the operators is:
\[ \text{Answer} = 20 \]

### Conclusion
The correct option is **B. 20**.