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  • Question
  • Third proportion of 10 and 20 is


  • Options
  • A. 30
  • B. 40
  • C. 25
  • D. 20

  • Correct Answer
  • 40 

    Explanation

    The third proportional of two numbers p and q is defined to be that number r such that

    p : q = q : r.

     

    Here, required third proportional of 10 & 20, and let it be 'a'

    => 10 : 20 = 20 : a

    10a = 20 x 20

    => a = 40

     

    Hence, third proportional of 10 & 20 is 40.

  • Tags: AIEEE, Bank Exams, CAT, GATE, GRE, Analyst, Bank Clerk, Bank PO, Database Administrator, IT Trainer

    Average problems


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    • 1. There are 100 students in 3 sections A, B and C of a class. The average marks of all the three sections was 84. The average of B and C was 87.5 and the average marks of students in A section was :

    • Options
    • A. 20
    • B. 35
    • C. 54
    • D. 40
    • Discuss
    • 2. The average price of 10 books is Rs. 12 while the average price of 8 of these books is Rs. 11.75. Of the remaining two books, if the price of one book is 60% more than the price of the other, what ia the pice of each of these two books ?

    • Options
    • A. 16,12
    • B. 10,16
    • C. 23,9
    • D. 8,7
    • Discuss
    • 3. Ian has 14 boxes of paper and divides them evenly between 4 coworkers. How many whole boxes did each coworker get?

    • Options
    • A. 2
    • B. 2.5
    • C. 3
    • D. 3.5
    • Discuss
    • 4. Five boxes of bananas sell for Rs. 30. how many boxes can you buy for Rs.9?

    • Options
    • A. 2
    • B. 1.5
    • C. 1.25
    • D. 2.5
    • Discuss
    • 5. A batsman in his 17th innings makes a score of 85 and their by increasing his average by 3. What is his average after the 17th innings ?

    • Options
    • A. 34
    • B. 36
    • C. 35
    • D. 37
    • Discuss
    • 6. The average of five numbers is 27. If one number is excluded, the average becomes 25. The excluded number is :

    • Options
    • A. 25
    • B. 35
    • C. 45
    • D. 55
    • Discuss
    • 7. Navaneet has thrice the money Poonam has and Poonam has 25% more money than Hebah. If the average money of the three is Rs. 350, What is the amount that Navaneet has ?

    • Options
    • A. Rs. 175
    • B. Rs. 220.75
    • C. Rs. 218.55
    • D. Rs. 656.25
    • Discuss
    • 8. The average marks of a student in 7 subjects is 85. His average marks in 6 subjects except English is 83. What is his marks in English ?

    • Options
    • A. 97
    • B. 98
    • C. 92
    • D. 93
    • Discuss
    • 9. Find the average of first 50 natural numbers?

    • Options
    • A. 25
    • B. 25.5
    • C. 26
    • D. 26.5
    • Discuss
    • 10. The average age of 36 students in a group is 14 years. When teacher's age is included to it, the average increases by one. What is the teacher's age in years ?

    • Options
    • A. 35 years
    • B. 45 years
    • C. 51 years
    • D. 54 years
    • Discuss


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