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  • Question
  • It takes five minutes to pass a rumour from one person to two other persons. The tree of rumour continues. Find how many minutes does it take spread the rumour to 729 persons ?


  • Options
  • A. 45 min
  • B. 25 min
  • C. 30 min
  • D. 36 min

  • Correct Answer
  • 30 min 

    Explanation

    After 5 mins ..... 3 persons will get rumour
    After 10 mins .... 3x2 + 3 = 9 = 3 2  persons will get
    after 15 =5x3 min ......9x2 + 9 =27 = 3 3  persons will get news.
    .
    .
    after 5x6 mins ... 3 6  = 729 persons will get news.

     

    Therefore, time taken to spread the rumour to 729 persons is 30 minutes.

  • Tags: GRE, GATE, CAT, Bank Exams, AIEEE, Bank PO, Bank Clerk

    More questions

    • 1. Choose the word which is different from the rest.

    • Options
    • A. Bajra
    • B. Mustard
    • C. Rice
    • D. Wheat
    • E. Barley
    • Discuss
    • 2. Find the odd one out:

    • Options
    • A. 263
    • B. 111
    • C. 242
    • D. 551
    • Discuss
    • 3. Find the odd one out:

    • Options
    • A. 21
    • B. 69
    • C. 81
    • D. 83
    • Discuss
    • 4. 16 : 56 :: 32 :?

    • Options
    • A. 96
    • B. 112
    • C. 120
    • D. 128
    • Discuss
    • 5. 8 : 24 ::? : 32

    • Options
    • A. 5
    • B. 6
    • C. 10
    • D. 8
    • Discuss
    • 6. 
      'Uneasy' is to 'Quite" as 'Fit' is to

    • Options
    • A. Proper
    • B. Suitable
    • C. Pertinent
    • D. Unfit
    • Discuss
    • 7. 
      NA

    • Options
    • A. Desire
    • B. Hope
    • C. Want
    • D. Belief
    • Discuss
    • 8. 
      Statement :
      1. Some clerks are poor;
      2. A is poor
      Conclusion :
      I. A is clerk.
      II. A has a large family.

    • Options
    • A. Both conclusions I and Ii
    • B. Only conclusion II
    • C. Only conclusion I follows.
    • D. Neither conclusion I nor conclusion Ii follows.
    • Discuss
    • 9. 
      Ant : Fly : Bee

    • Options
    • A. Termite
    • B. Insect
    • C. Lizard
    • D. Small
    • Discuss
    • 10. 
      NA

    • Options
    • A. Radium
    • B. Thorium
    • C. Sodium
    • D. Uranium
    • Discuss


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