Practice Questions on Number System
Aptitude Questions and Answers

Moderate Number System Question - 11

Q11.

When writing numbers from 1 to 10,000, how many times is the digit 9 written?

A.

3200

B.

3600

C.

4000

D.

4200

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Moderate Number System Question - 12

Q12.

Which digits should come in place of @ and # if the number 62684@# is divisible by both 8 and 5?

A.

4, 0

B.

0, 4

C.

4, 4

D.

1, 1

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Moderate Number System Question - 13

Q13.

How many keystrokes are needed to type numbers from 1 to 1000 on a standard keyboard?

A.

3001

B.

2893

C.

2704

D.

2890

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Moderate Number System Question - 14

Q14.

How many natural numbers below 660 are divisible by 5 and 11 but not by 3?

A.

8

B.

9

C.

10

D.

11

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Moderate Number System Question - 15

Q15.

What is the maximum value of $m$ such that $7^m$ divides into 14! evenly?

A.

1

B.

2

C.

3

D.

4

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