Practice Questions on Number System
Aptitude Questions and Answers

Easy Number System Question - 16

Q16.

$(AA)^2 = DCBA$, where $A$, $B$, $C$ and $D$ are distinct digits with $B$ being odd. Find the value of $D$.

A.

4

B.

6

C.

1

D.

1 or 4

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Easy Number System Question - 17

Q17.

What is the last digit of the number 3579+ 1?

A.

1

B.

3

C.

4

D.

7

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Easy Number System Question - 18

Q18.

If $x$ and $y$ are any natural numbers, then which of the following is an odd number?

A.

$x^y + y^x + (x-y)(x^y + x)$

B.

$x^y (x + y)(x^y + x)$

C.

$y^x (x^y – y) (x^y - x)$

D.

None of these

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Easy Number System Question - 19

Q19.

A and B are playing mathematical puzzles. A asks B "which whole numbers, greater than one, can divide all the nine three digit numbers $111, 222, 333, 444, 555, 666,$ $777, 888$ and $999$?"

B immediately gave the desired answer. It was:

A.

3, 37 and 119

B.

3, 37 and 111

C.

9, 37 and 111

D.

3, 9 and 37

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Easy Number System Question - 20

Q20.

Two prime numbers $A, B(A < B)$ are called twin primes if they differ by 2 (e.g. 11,13,or 41,43....).

If A and B are twin primes with $B > 23$, then which of the following numbers would always divide $A+B$?

A.

12

B.

8

C.

24

D.

None of these

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