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Quantitative Aptitude

NUMBER SERIES MCQs

Number Theory

Total Questions : 166 | Page 16 of 17 pages
Question 151. 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
 Discuss Question
Answer: Option D. -> 54
Answer: (d).54
Question 152. The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1 : 2 ?
  1.    4
  2.    8
  3.    16
  4.    None of these
 Discuss Question
Answer: Option B. -> 8
Answer: (b).8
Question 153. A two-digit number is such that the product of the digits is 8. When 18 is added to the number, then the digits are reversed. The number is:
  1.    18
  2.    24
  3.    42
  4.    81
 Discuss Question
Answer: Option B. -> 24
Answer: (b).24
Question 154. The sum of the squares of three numbers is 138, while the sum of their products taken two at a time is 131. Their sum is:
  1.    20
  2.    30
  3.    40
  4.    None of these
 Discuss Question
Answer: Option A. -> 20
Answer: (a).20
Question 155. The sum of the digits of a two-digit number is 15 and the difference between the digits is 3. What is the two-digit number?
  1.    69
  2.    78
  3.    96
  4.    Cannot be determined
 Discuss Question
Answer: Option D. -> Cannot be determined
Answer: (d).Cannot be determined
Question 156. A number consists of two digits. If the digits interchange places and the new number is added to the original number, then the resulting number will be divisible by:
  1.    3
  2.    5
  3.    9
  4.    11
 Discuss Question
Answer: Option D. -> 11
Answer: (d).11
Question 157. √1.5625 = ?
  1.    1.05
  2.    1.25
  3.    1.45
  4.    1.55
 Discuss Question
Answer: Option B. -> 1.25
Answer: (b).1.25
Question 158. The square root of (7 + 3√5) (7 - 3√5) is
  1.    √5
  2.    2
  3.    4
  4.    3√5
 Discuss Question
Answer: Option B. -> 2
Answer: (b).2
Question 159. A group of students decided to collect as many paise from each member of group as is the number of members. If the total collection amounts to Rs. 59.29, the number of the member is the group is:
  1.    57
  2.    67
  3.    77
  4.    87
 Discuss Question
Answer: Option C. -> 77
Answer: (c).77
Question 160. How many two-digit numbers satisfy this property.: The last digit (unit's digit) of the square of the two-digit number is 8 ?
  1.    1
  2.    2
  3.    3
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Answer: (d).None of these

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