Number System

Number System Questions: What is Number System in Maths? Divisibility Rules for 7, Divisibility Rules for 11, Binomial Theorem Questions, Factorize Expressions

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Online Aptitude Questions with Answers on Number System

Q16. David gets on the elevator at the 11th floor of a building and rides up at the rate of 57 floors per minute. At the same time, Albert gets on an elevator at the 51st floor of the same building and rides down at the rate of 63 floors per minute. If they continue travelling at these rates, then at which floor will their paths cross ?

1.  19
2.  28
3.  30
4.  37

Solution : 30
Q17. **If one-third of one-fourth of a number is 15, then three-tenth of that number is:**

1.  35
2.  36
3.  45
4.  54

Solution : 54
Q18. **Three times the first of three consecutive odd integers is 3 more than twice the third. The third integer is:**

1.  9
2.  11
3.  13
4.  15

Solution : 15
Q19. **The difference between a two-digit number and the number obtained by interchanging the positions of its digits is 36. What is the difference between the two digits of that number?**

1.  3
2.  4
3.  9
4.  Cannot be determined
5.  None of these

Solution : 4

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Q20. **In a two-digit, if it is known that its unit's digit exceeds its ten's digit by 2 and that the product of the given number and the sum of its digits is equal to 144, then the number is:**

1.  24
2.  26
3.  42
4.  46

Solution : 24
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