# Practice Questions on Number SystemAptitude 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

## 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

## 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

## 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

## 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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