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Home Aptitude Time and Work See What Others Are Saying!
  • Question
  • 15 men would finish a piece of work in 210 days. But at the end of every 10 days. 15 additional men are employed. In how many days will it be finished?


  • Options
  • A. 30 days
  • B. 70 days
  • C. 35 days
  • D. 60 days

  • Correct Answer
  • 60 days 

    Explanation

    10 day's work by 15 men = 10/210 = 1/21
    At the end of every 10 days 15 additional men are employed i.e., for the next 10 days we have 15 + 15 = 30 men
    ? Next 10 day's work by 30 men = 2/21
    Hence in 20 days only (1/21 + 2/21) = 3/21 work is completed
    To complete the whole work we have to reach the value of (21/21) work.
    Now, (1/21) + (2/21) + (3/21) + ......... (6/21) = 21/21 = 1
    Hence total time to complete the whole wok 10 + 10 + 10 + 10 + 10 + 10 = 60 days


  • More questions

    • 1. It takes eight hours for a 600 km journey, if 120 km is done by train and the rest by car. It takes 20 minutes more, if 200 km is done by train and the rest by car. The ratio of the speed of the train to that of the cars is:

    • Options
    • A. 2 : 3
    • B. 3 : 2
    • C. 3 : 4
    • D. 4 : 3
    • Discuss
    • 2. 
      A certain sum amounts to Rs 1586 in 2 year and Rs 1729 in 3 year. Find the rate and the sum.

    • Options
    • A. 8 %
    • B. 9 %
    • C. 10 %
    • D. 11 %
    • Discuss
    • 3. 
      (21 + 99) x (30 - 19.02) =?

    • Options
    • A. 3581
    • B. 131
    • C. 1290
    • D. None of these
    • Discuss
    • 4. 
      In a game A can give B 25 points in 75 and C 18 points in 90. How many points can C give B in a game of 120?

    • Options
    • A. 20
    • B. 30
    • C. 40
    • D. 50
    • Discuss
    • 5. 
      The average of 6 number 13, 17, 25, 11, 26, 10 is

    • Options
    • A. 20
    • B. 17
    • C. 15
    • D. 25
    • Discuss
    • 6. 
      A cistern has a leak which would empty it in 15 hours. A tap is turned on which admits 2 litres per hour into the cistern and it is now emptied in 10 hours. How many litres does the cistern hold?

    • Options
    • A. 50 litres
    • B. 60 litres
    • C. 45 litres
    • D. 360 litres
    • Discuss
    • 7. 
      Average of a,b and c is 11, average of c,d and e is 17 average of e and f is 22 and the average of e and c is 17 . Find out the average of a, b, c, d, e and f.

    • Options
    • A. 151?3
    • B. 162?3
    • C. 171?2
    • D. 152?3
    • Discuss
    • 8. 
      A man buys 3 cows and 18 goats in ? 47,200. Instead if he would have bought 8 cows and 3 goats, he had to pay ? 53,000 more. Cost of one cow is:

    • Options
    • A. ? 10,000
    • B. ? 11,000
    • C. ? 12,000
    • D. ? 13,000
    • Discuss
    • 9. Six years ago, the ratio of the ages of Kunal and Sagar was 6 : 5. Four years hence, the ratio of their ages will be 11 : 10. What is Sagar's age at present?

    • Options
    • A. 16 years
    • B. 18 years
    • C. 20 years
    • D. Cannot be determined
    • E. None of these
    • Discuss
    • 10. 
      (17.28 ÷? ) / (3.6 x 0.2) = 2

    • Options
    • A. 120
    • B. 1.20
    • C. 12
    • D. 0.12
    • Discuss


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