logo

CuriousTab

CuriousTab

Discussion


Home Aptitude Logarithm See What Others Are Saying!
  • Question
  • Given log 10 2 = 0.30103, log 10 3 = 0.47712. Find the number of digit, in 3 12 x 2 8?


  • Options
  • A. 6
  • B. 7
  • C. 8
  • D. 9

  • Correct Answer


  • Explanation

    Let N = 312 x 28
    ? log N = 12 x log3 + 8 x log 2
    ? log N = 12 x 0.47712 + 8 x 0.30103
    ? log N = 8.13368
    ? No.of digits = 8 + 1 = 9

  • Tags: GRE

    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