Write $100\times a+10\times c+b$ in the usual form.

Minakshi asks Sundaram to think of a $2$-digit number, and then to do whatever she asks him to do, to that number. Their conversation is shown in the following figure.

Check what the result would have been if Sundaram had chosen the number $27$.

Minakshi asks Sundaram to think of a $2$-digit number, and then to do whatever she asks him to do, to that number. Their conversation is shown in the following figure.

Check what the result would have been if Sundaram had chosen the number $39$.

Minakshi asks Sundaram to think of a $2$-digit number, and then to do whatever she asks him to do, to that number. Their conversation is shown in the following figure.

Check what the result would have been if Sundaram had chosen the number $64$.

Minakshi asks Sundaram to think of a $2$-digit number, and then to do whatever she asks him to do, to that number. Their conversation is shown in the following figure.

Check what the result would have been if Sundaram had chosen the number $17$.

The conversation between Minakshi and Sundaram is given below,

Minakshi: Think of a $2$-digit number, but don't tell me what it is.

Sundaram: Alright.

Minakshi: Now reverse the digits of the number and subtract the smaller number from the larger one.

Sundaram: I have done the subtraction. What next?

Minakshi: Now, divide your answer by $9$. I claim that there will be no remainder!

Sundaram: Yes, you are right. There is indeed no remainder! But this time I think I know how you are so sure of this!

Sundaram had thought of a number $29$.

Check what the result would have been if Sundaram had chosen the number $17$.

The conversation between Minakshi and Sundaram is given below,

Minakshi: Think of a $2$-digit number, but don't tell me what it is.

Sundaram: Alright.

Minakshi: Now reverse the digits of the number and subtract the smaller number from the larger one.

Sundaram: I have done the subtraction. What next?

Minakshi: Now, divide your answer by $9$. I claim that there will be no remainder!

Sundaram: Yes, you are right. There is indeed no remainder! But this time I think I know how you are so sure of this!

Sundaram had thought of a number $29$.

Check what the result would have been if Sundaram had chosen the number $21$.

The conversation between Minakshi and Sundaram is given below,

Minakshi: Think of a $2$-digit number, but don't tell me what it is.

Sundaram: Alright.

Minakshi: Now reverse the digits of the number and subtract the smaller number from the larger one.

Sundaram: I have done the subtraction. What next?

Minakshi: Now, divide your answer by $9$. I claim that there will be no remainder!

Sundaram: Yes, you are right. There is indeed no remainder! But this time I think I know how you are so sure of this!

Sundaram had thought of a number $29$.

Check what the result would have been if Sundaram had chosen the number $96$.

The conversation between Minakshi and Sundaram is given below,

Minakshi: Think of a $2$-digit number, but don't tell me what it is.

Sundaram: Alright.

Minakshi: Now reverse the digits of the number and subtract the smaller number from the larger one.

Sundaram: I have done the subtraction. What next?

Minakshi: Now, divide your answer by $9$. I claim that there will be no remainder!

Sundaram: Yes, you are right. There is indeed no remainder! But this time I think I know how you are so sure of this!

Sundaram had thought of a number $29$.

Check what the result would have been if Sundaram had chosen the number $37$.