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  • Question
  • A contractor undertook to do a certain piece of the work in 18 days. He employed certain number of men but 12 of them being absent from the very 1st day, the rest could finish the work in 30 days . Find the number of men originally employed.


  • Options
  • A. 40
  • B. 15
  • C. 45
  • D. 30

  • Correct Answer
  • 30 

    Explanation

    Let the number of the men at the beginning = N
    Given, M1 = N, M2 = N - 12, D1 = 18 and D2 = 30

    According to the formula
    M1D1 = M2D2
    ? N x 18 = (N - 12) x 30
    ? 3N = 5N - 60
    ? 2N = 60
    ? N = 30


  • More questions

    • 1. 
      198.995 x 12.005 + 16.25 x 6.95 =?

    • Options
    • A. 2580
    • B. 2550
    • C. 2400
    • D. 2500
    • Discuss
    • 2. 
      The face value of 8 in the numeral 458926 is?

    • Options
    • A. 8000
    • B. 8
    • C. 1000
    • D. 458000
    • Discuss
    • 3. 
      6, 9, 15, 21, 24, 28, 30?

    • Options
    • A. 25
    • B. 21
    • C. 24
    • D. 30
    • Discuss
    • 4. 
      6674 x 625 =?

    • Options
    • A. 4170160
    • B. 4072360
    • C. 4171050
    • D. 4171250
    • Discuss
    • 5. 
      If ax + by = 6, bx ? ay = 2 and x 2 + y 2 = 4, then the value of ( a 2 + b 2) would be :

    • Options
    • A. 10
    • B. 2
    • C. 4
    • D. 5
    • Discuss
    • 6. 
      What if the probability of getting a king or a queen in a single drawn from a pack of 52 cards?

    • Options
    • A. 1/26
    • B. 1/13
    • C. 2/13
    • D. None of these
    • Discuss
    • 7. 
      Find the 4th proportional to 4 , 16 and 7 ,

    • Options
    • A. 28
    • B. 29
    • C. 22
    • D. 25
    • Discuss
    • 8. 
      Raj sold an item for ? 6384 and incurred a loss of 30%. At what price should he have sold the item to have gained a profit of 30%

    • Options
    • A. ? 14656
    • B. ? 11856
    • C. ? 13544
    • D. cannot be determind
    • Discuss
    • 9. 
      (2/3) x (6/8) x (2/3) x (3/4) =?

    • Options
    • A. 0.25
    • B. 0.5
    • C. 1.45
    • D. 11.8
    • Discuss
    • 10. 
      The HCF and LCM of two natural numbers are 12 and 72, respectively. What is the difference between the two numbers, if one of the number is 24?

    • Options
    • A. 12
    • B. 18
    • C. 21
    • D. 24
    • Discuss


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