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Home Aptitude Problems on H.C.F and L.C.M See What Others Are Saying!
  • Question
  • What will be the least number which when doubled will be exactly divisible by 12, 18, 21 and 30?


  • Options
  • A. 196
  • B. 630
  • C. 1260
  • D. 2520

  • Correct Answer
  • 630 

    Explanation
     L.C.M. of 12, 18, 21 30                 2 | 12  -  18  -  21  -  30
                                             ----------------------------
       = 2 x 3 x 2 x 3 x 7 x 5 = 1260.       3 |  6  -   9  -  21  -  15
                                             ----------------------------
       Required number = (1260 ? 2)            |  2  -   3  -   7  -   5
    
                       = 630.
    

  • More questions

    • 1. The following question consist of two words that have a certain relationship to each other, followed by four alternatives. Select the best alternative that has the same relationship as the original pair of words Liquor: Drink

    • Options
    • A. Bread: Butter
    • B. Tea: Beverage
    • C. Sniff: Inhale
    • D. Water: Sip
    • Discuss
    • 2. In the following question, select the related word pair from the given alternatives. Gun : Soldier : : ? : ?

    • Options
    • A. Pen : Carpenter
    • B. Plough : Surgeon
    • C. Chisel : Sculptor
    • D. Sword : Doctor
    • Discuss
    • 3. Fumble is to Finesse as Malign is to

    • Options
    • A. Slander
    • B. Extol
    • C. Criticize
    • D. Assurance
    • Discuss
    • 4. The following question consist of two words that have a certain relationship to each other, followed by four alternatives. Select the best alternative that has the same relationship as the original pair of words Evaporation: Cloud

    • Options
    • A. Mountain: Snow
    • B. Book: Pages
    • C. Pressure: Atmosphere
    • D. Tension: Breakdown
    • Discuss
    • 5. Select the related word/letters/numbers from the given alternatives: Length:Meter::Power:?

    • Options
    • A. Calories
    • B. Degree
    • C. Watt
    • D. Kilogram
    • Discuss
    • 6. 6 : 18 :: 4 : ?

    • Options
    • A. 14
    • B. 6
    • C. 16
    • D. 8
    • Discuss
    • 7. The following question consist of two words that have a certain relationship to each other, followed by four alternatives. Select the best alternative that has the same relationship as the original pair of words Cream: Cosmetics

    • Options
    • A. Tiger: Forest
    • B. Mountain: Valley
    • C. Magazine: Editor
    • D. Teak: Wood
    • Discuss
    • 8. Select the related word/letters/numbers from the given alternatives: ZXVT:YWUS::RPNL:?

    • Options
    • A. XVTS
    • B. TSQP
    • C. SQPM
    • D. QOMK
    • Discuss
    • 9. Rubber is related to Tree in the same way as Silk is related to ______

    • Options
    • A. Cloth
    • B. Insects
    • C. Fabric
    • D. Weave
    • Discuss
    • 10. The following question consist of two words that have a certain relationship to each other, followed by four alternatives. Select the best alternative that has the same relationship as the original pair of words Carnivore: Herbivore

    • Options
    • A. Flesh: Plant
    • B. Horse: Lion
    • C. Camel: Giraffe
    • D. Animal: Bird
    • Discuss


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