logo

CuriousTab

CuriousTab

Discussion


Home Aptitude Simplification See What Others Are Saying!
  • Question
  • Of three positive numbers the product of the first and second is 42, that of the second and third is 56 and that of third and first is 48, The third number is


  • Options
  • A. 12
  • B. 6
  • C. 7
  • D. 8

  • Correct Answer


  • Explanation

    Let first, second and third numbers be x , y and z, respectively.
    Then , xy = 42.................(i)
    yz = 56 ..................(ii)
    xz = 48 ....................(iii)
    Multiplying Eqs ( i), (ii) and (iii), we get
    (xyz)2 = 42 x 56 x 48
    ? (xyz)2 = 112896
    ? xyz = 336 ................(iv)
    Dividing Eq. (iv) by Eq. (i), we get
    xyz/xy = 336/42 ? z = 8


  • More questions

    • 1. 
      The value of 47 / 10000 is?

    • Options
    • A. .0047
    • B. .0470
    • C. .00047
    • D. .000047
    • Discuss
    • 2. If 4x = 18y, then the value of ( x/y - 1) is

    • Options
    • A. 1 3
    • B. 7 2
    • C. 2 3
    • D. 3 2
    • Discuss
    • 3. 
      If the price of 23 toys is Rs. 276, then what will the price (Rs.) of 12 toys?

    • Options
    • A. 144
    • B. 158
    • C. 159
    • D. 166
    • Discuss
    • 4. 
      .02 =(......?.....)%

    • Options
    • A. 20
    • B. 2
    • C. .02
    • D. .2
    • Discuss
    • 5. 
      If 36 men can do a piece of work in 25 hours, in how many hours will 15 men do it?

    • Options
    • A. 45
    • B. 55
    • C. 60
    • D. 72
    • Discuss
    • 6. 
      2?63 / 11 =233

    • Options
    • A. 4
    • B. 3
    • C. 6
    • D. 5
    • Discuss
    • 7. 
      When 121012 is divided by 12, the remainder is

    • Options
    • A. 0
    • B. 2
    • C. 3
    • D. 4
    • Discuss
    • 8. 
      Aarti can do a piece of work in 6 days. In how many days will she complete three time of work of same type?

    • Options
    • A. 18 days
    • B. 21 days
    • C. 3 days
    • D. 6 days
    • Discuss
    • 9. 
      750.0003 ÷ 19.999 =?

    • Options
    • A. 49
    • B. 18
    • C. 22
    • D. 38
    • Discuss
    • 10. 
      105, 85, 60, 30, 0, - 45, - 90?

    • Options
    • A. 0
    • B. 85
    • C. -45
    • D. 60
    • Discuss


    Comments

    There are no comments.

Enter a new Comment