logo

CuriousTab

CuriousTab

Discussion


Home Aptitude Average See What Others Are Saying!
  • Question
  • The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?


  • Options
  • A. 0
  • B. 1
  • C. 10
  • D. 19

  • Correct Answer
  • 19 

    Explanation
    Average of 20 numbers = 0.

    ∴ Sum of 20 numbers (0 x 20) = 0.

    It is quite possible that 19 of these numbers may be positive and if their sum is a then 20th number is (-a).


  • More questions

    • 1. 
      In the accompanying figure, AB is one of the diameters of the circle and OC is perpendicular to it through the centre O. If AC is 7?2 cm, then what is the area of the circle in cm 2?

    • Options
    • A. 24.5
    • B. 49
    • C. 98
    • D. 154
    • Discuss
    • 2. 
      3120 ÷ 26 + 13 x 30 =?

    • Options
    • A. 2400
    • B. 3900
    • C. 536
    • D. None of these
    • Discuss
    • 3. 
      The average of 13 results is 60. If the average of first 7 result is 59 and that of last 7 results is 61, What will be the seventh result?

    • Options
    • A. 90
    • B. 50
    • C. 75
    • D. 60
    • Discuss
    • 4. 
      The radius of a circle has been reduced from 9 cm to 7 cm . the appropriate percentage decrease in area is?

    • Options
    • A. 31.5 %
    • B. 39.5 %
    • C. 34.5 %
    • D. 65.5 %
    • Discuss
    • 5. 
      Find the value of 27 x 1. 2 x 5.526 2 x 0. 6 .

    • Options
    • A. 121.57
    • B. 121.75
    • C. 121.75
    • D. None of these
    • Discuss
    • 6. 
      The sum of two numbers is 24 and their product is 143. The sum of their squares is

    • Options
    • A. 296
    • B. 295
    • C. 290
    • D. 228
    • Discuss
    • 7. 
      The probability that a man aged x years will die in a years is p. The probability that out of n men M1, M2, M3...... Mn each aged n years Mk will die and be the first to die is?

    • Options
    • A. 1/n2
    • B. 1 - (1 - p)n
    • C. 1/n2[1 - (1- p)n
    • D. 1/n[1 - (1 - p)n]
    • Discuss
    • 8. 
      If log (0.57) = 1756, then the value of log 57 + log (0.57) 3 + log ? 0.57 is?

    • Options
    • A. 0.902
    • B. 1.902
    • C. 1.146
    • D. 2.146
    • Discuss
    • 9. 
      ? 132 + 28 / 4 - (3)3 + 107 = (?) 2

    • Options
    • A. 2
    • B. 16
    • C. 256
    • D. 4
    • Discuss
    • 10. 
      A is thrice as good a workman as B and therefore is able to finish a job in 30 days less then B. How many days will they takes to finish the job working together?

    • Options
    • A. 101/4
    • B. 113/4
    • C. 111/4
    • D. 111/3
    • Discuss


    Comments

    There are no comments.

Enter a new Comment