What is the two digit number ?
I. Difference between the digits is 7.
II. Sum of the digits is 11.

if the data in statement I alone is sufficient to answer the question, while the data in statement II alone is not sufficient to answer the question

if the data in statement II alone is sufficient to answer the question, while the data in statement I alone is not sufficient to answer the question

if the data either in statement I alone or in statement II alone is sufficient to answer the question.

if the data in both the statements I and II together are not sufficient to answer the question.

if the data in both the statements I and II together are necessary to answer the question.

Answer : Option D

Explanation :

Let the number be 10x + y

From statement I,

x – y = 7 or y – x = 7 ....(i)

From Statement II,

x + y = 11 ....(ii)

Now, solving x – y = 7 and x + y = 11,

we get x = 9, y = 2

Solving y – x = 7 and x + y = 11,

we get y = 9 and x = 2

Hence, the possible numbers are 92 and 29. Clearly, uniqueness of answer is not satisfied.

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