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Home Aptitude HCF and LCM See What Others Are Saying!
  • Question
  • If the sum of two numbers is 55 and the H.C.F and L.C.M of these numbers are 5 and 120 respectively, then the sum of the reciprocals of the numbers is equal to


  • Options
  • A. 55/601
  • B. 601/55
  • C. 11/120
  • D. 120/11

  • Correct Answer
  • 11/120 

    Explanation

    Let the numbers be a and b . Then, a+b =55 and ab = 5 x 120 = 600.

     

    Therefore, Required sum =  1 a + 1 b = a + b a b = 55 600 = 11 120


  • More questions

    • 1. In the following question, four groups of three numbers are given. In each group the second and third number are related to the first number by aLogic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

    • Options
    • A. (13, 26, 39)
    • B. (15, 30, 45)
    • C. (17, 34, 51)
    • D. (19, 38, 59)
    • Discuss
    • 2. If the value of a company stock drops from Rs. 25 per share to Rs. 21 per share, the percentage decrease per share is

    • Options
    • A. 4
    • B. 8
    • C. 12
    • D. 16
    • Discuss
    • 3. The average age of a couple and their son was 40 years, the son got married and a child was born just two years after their marriage. When child turned to 10 years, then the average age of the family becomes 38 years. What was the age of the daughter in law at the time of marriage ?

    • Options
    • A. 12 years
    • B. 10 years
    • C. 14 years
    • D. 13 years
    • Discuss
    • 4. In what ratio sugar at Rs 30/kg should be mixed with sugar at Rs 45/kg so that on selling the mixture at Rs 42/kg there is a profit of 20%?

    • Options
    • A. 2 : 1
    • B. 2 : 3
    • C. 5 : 2
    • D. 3 : 7
    • Discuss
    • 5. If 5 3x < 4 x and 5(2 x) > 2 2x, then x can take which of the following values?

    • Options
    • A. 0
    • B. 1
    • C. 3
    • D. -1
    • Discuss
    • 6. Find the odd word/letters/number from the given alternatives.

    • Options
    • A. House
    • B. Stable
    • C. Hut
    • D. Cottage
    • Discuss
    • 7. If the price of kerosene be raised by 11%, find by how much percent a house holder must reduce his consumption of kerosene so as not to increase his expenditure?

    • Options
    • A. 11%
    • B. 9.09%
    • C. 11.09%
    • D. 8.25%
    • Discuss
    • 8. If 2x + 3y = 0 and 3x - 4y = 34, then x - y = ______

    • Options
    • A. 10
    • B. -10
    • C. 2
    • D. -2
    • Discuss
    • 9. Find the odd word/letters/number from the given alternatives.

    • Options
    • A. BDGK
    • B. JLOS
    • C. NPSW
    • D. MORU
    • Discuss
    • 10. A shopkeeper marks his goods 40% above the cost price and allows a discount of 25% on it. His gain % is

    • Options
    • A. 5%
    • B. 10%
    • C. 15%
    • D. 20%
    • Discuss


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