Change symbol and solve accordingly to find correct answer from the alternatives given below:
`9xx8xx7=24,4xx7xx3=14,2xx1xx9=?`

Options

A. 10
B. 18
C. 11
D. 12

Explanation

To solve the problem, we need to change the multiplication symbols (xx) in the equations to addition symbols (+) and then compute the results accordingly.

### Step-by-step Solution:

1. **First Equation:**
- Original: \( 9 \, \text{xx} \, 8 \, \text{xx} \, 7 = 24 \)
- Change symbols: \( 9 + 8 + 7 \)
- Calculation:
\[ 9 + 8 = 17 \\ 17 + 7 = 24 \]
- This confirms that the first equation is correct.

2. **Second Equation:**
- Original: \( 4 \, \text{xx} \, 7 \, \text{xx} \, 3 = 14 \)
- Change symbols: \( 4 + 7 + 3 \)
- Calculation:
\[ 4 + 7 = 11 \\ 11 + 3 = 14 \]
- This confirms that the second equation is also correct.

3. **Third Equation:**
- Original: \( 2 \, \text{xx} \, 1 \, \text{xx} \, 9 = ? \)
- Change symbols: \( 2 + 1 + 9 \)
- Calculation:
\[ 2 + 1 = 3 \\ 3 + 9 = 12 \]
- Therefore, the answer to the third equation is \( 12 \).

### Final Answer:
The answer to \( 2 \, \text{xx} \, 1 \, \text{xx} \, 9 \) is \( 12 \).

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