Each of the questions below consists of a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and--
What is the two digit number ?
I. The difference between the two digits is 9.
II. The sum of the digits is equal to the difference between the two digits.
I : The difference between two digits is 9 only if the digits are 0 and 9.
No. using these digits = 90 and 09.
Since, 90 is the only two digit no. Ans - 90
Thus, I alone is sufficient.
II : Let one's digit be y and ten's digit be x. => Number = 10x + y
x + y = x - y
=> y = 0 & x can be any digit.
Thus, number can be 10,20,30,40...
Thus, II alone is not sufficient.
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