If 'P' means 'divided by ' 'T' means 'add' , 'M' means 'subtract' and 'D' means 'multipled by' , then what will be the value of the following expression
12 M 12 D 28 P 7 T 15
A. -21
B. 15
C. 30
D.-15

Options

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

Answer

To solve the expression \( 12 \, M \, 12 \, D \, 28 \, P \, 7 \, T \, 15 \) with the given meanings of the symbols, we will first replace each symbol with its corresponding mathematical operation.

1. **Identify the operations:**
- \( M \) means 'subtract' (−)
- \( D \) means 'multiply' (×)
- \( P \) means 'divide' (÷)
- \( T \) means 'add' (+)

2. **Rewrite the expression:**
The expression \( 12 \, M \, 12 \, D \, 28 \, P \, 7 \, T \, 15 \) can be rewritten as:
\[ 12 - (12 \times 28) \div 7 + 15 \]

3. **Calculate the multiplication:**
First, we calculate \( 12 \times 28 \):
\[ 12 \times 28 = 336 \]

4. **Calculate the division:**
Next, we divide \( 336 \) by \( 7 \):
\[ 336 \div 7 = 48 \]

5. **Substitute back into the expression:**
Now we substitute back into the expression:
\[ 12 - 48 + 15 \]

6. **Perform the subtraction:**
First, we perform the subtraction:
\[ 12 - 48 = -36 \]

7. **Perform the addition:**
Finally, we add \( 15 \):
\[ -36 + 15 = -21 \]

Thus, the value of the expression is \(-21\).

### Final Answer:
The correct option is **A. -21**.