number-system

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

Q1. Which one of the following is not a prime number?

  1.  31
  2.  61
  3.  71
  4.  91

Solution : 91
Q2. A man has Rs. 480 in the denominations of one-rupee notes, five-rupee notes and ten-rupee notes. The number of notes of each denomination is equal. What is the total number of notes that he has ?

  1.  45
  2.  60
  3.  75
  4.  90

Solution : 90
Q3. There are two examinations rooms A and B. If 10 students are sent from A to B, then the number of students in each room is the same. If 20 candidates are sent from B to A, then the number of students in A is double the number of students in B. The number of students in room A is

  1.  22
  2.  80
  3.  100
  4.  200

Solution : 100
Q4. The price of 10 chairs is equal to that of 4 tables. The price of 15 chairs and 2 tables together is Rs. 4000. The total price of 12 chairs and 3 tables is:

  1.  Rs. 3500
  2.  Rs. 3750
  3.  Rs. 3840
  4.  Rs. 3900

Solution : Rs. 3900

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Q5. If a - b = 3 and a^2 + b^2 = 29, find the value of ab.

  1.  10
  2.  12
  3.  15
  4.  18

Solution : 10
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