If a stands for 'add', B stands for 'subtract' C stands for 'divide' and D stands for 'multiply', then what is the value of
(7 D 3) B 6 A 5 (20 C 20)

Options

A. 0
B. 10
C. 22
D. 20

Answer

To solve the expression given in the question, we need to replace the letters with their respective mathematical operations and then follow the order of operations (BODMAS/BIDMAS).

### Step-by-Step Solution:

1. **Replace the letters with operations:**
- A = add (+)
- B = subtract (−)
- C = divide (÷)
- D = multiply (×)

Thus, the expression:
\[ (7 \, D \, 3) \, B \, 6 \, A \, 5 \, (20 \, C \, 20) \]
becomes:
\[ (7 \times 3) - 6 + 5 \, (20 \div 20) \]

2. **Calculate the multiplication and division first:**
- Calculate \(7 \times 3\):
\[ 7 \times 3 = 21 \]
- Calculate \(20 \div 20\):
\[ 20 \div 20 = 1 \]

Now the expression simplifies to:
\[ 21 - 6 + 5 \times 1 \]

3. **Now, replace \(5 \times 1\) with its value:**
\[ 5 \times 1 = 5 \]

The expression now looks like:
\[ 21 - 6 + 5 \]

4. **Perform the subtraction and addition from left to right:**
- First, calculate \(21 - 6\):
\[ 21 - 6 = 15 \]
- Then add \(5\):
\[ 15 + 5 = 20 \]

5. **Final Result:**
The value of the expression is:
\[ \boxed{20} \]