Problems on Numbers - General Aptitude
A
I alone sufficient while II alone not sufficient to answer
B
II alone sufficient while I alone not sufficient to answer
C Either I or II alone sufficient to answer
D Both I and II are not sufficient to answer
E Both I and II are necessary to answer
ANS:E - Both I and II are necessary to answer Let the tens and unit digits be x and y respectively. Then,
I. x - y = 9.
II. x + y = x - y.
From I and II, we get x - y = 9 and x + y = 9.
On solving, we get x = 9 and y = 0.
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Required number is 90.
Thus, both I and II are needed to get the answer.
