In the questions, there is a certain relationship between the two given numbers on one side of :: and one number is given on another side of :: . It is required to find another number from the given alternative having the same relationship with this number as the numbers of the given pair has :
81:27:: 573:?

Options

A. 67
B. 181
C. 191
D. 243

Explanation

To solve the analogy problem 81:27::573:?, we need to identify the relationship between the first pair of numbers (81 and 27) and apply the same relationship to the number 573 to find the missing number.

### Step-by-Step Solution:

1. **Identify the Relationship**:
- The first pair is 81 and 27.
- We can observe that 81 is divided by 3 to get 27.
- Therefore, the relationship can be expressed as:
\[ 81 \div 3 = 27 \]

2. **Apply the Same Relationship**:
- Now, we need to apply the same operation (dividing by 3) to the second number, which is 573.
- We will perform the following calculation:
\[ 573 \div 3 \]

3. **Perform the Division**:
- Dividing 573 by 3:
- First, divide 5 by 3, which goes 1 time (1).
- Subtract 3 from 5, which leaves 2.
- Bring down the next digit (7), making it 27.
- Divide 27 by 3, which goes 9 times (9).
- Subtract 27 from 27, which leaves 0.
- Bring down the next digit (3), making it 3.
- Divide 3 by 3, which goes 1 time (1).
- Subtract 3 from 3, which leaves 0.
- Therefore, the result of the division is:
\[ 573 \div 3 = 191 \]

4. **Conclusion**:
- The missing number that has the same relationship with 573 as 27 has with 81 is:
\[ 191 \]

### Final Answer:
Thus, the answer is 191.

---