Problems on Numbers

Q1:

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.

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. Required number is 90. Thus, both I and II are needed to get the answer. Correct answer is (E).

Share :

img not found

For help Students Orientation
Mcqs Questions

One stop destination for examination, preparation, recruitment, and more. Specially designed online test to solve all your preparation worries. Go wherever you want to and practice whenever you want, using the online test platform.