Quiz Discussion

If the mean of a,b,c is M and ab+bc+ca=0, then the mean of a2,b2,c2 is:

Course Name: Quantitative Aptitude

  • 1]

    M2

  • 2]

    3M2

  • 3]

    6M2

  • 4]

    9M2

Solution
No Solution Present Yet

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# Quiz
1
Discuss

The average of two numbers is XY. If one number is X, the other is-

  • 1]

    Y/2

  • 2]

    Y

  • 3]

    2XY - X

  • 4]

    X (Y - 1)

Solution
2
Discuss

The average age of 30 students is 9 years. If the age of their teacher is included, the average age becomes 10 years. The age of the teacher (in years) is :

  • 1] 27
  • 2] 31
  • 3] 35
  • 4] 40
Solution
3
Discuss

The average of X1, X2 and X3 is 14. Twice the sum of X2 and X3 is 30. What is the value of X1?

  • 1] 12
  • 2] 16
  • 3] 20
  • 4] 27
Solution
4
Discuss

The average of five numbers is 306.4. The average of the first two numbers is 431 and the average of the last two numbers is 214.5. What is the third number?

  • 1] 52
  • 2] 108
  • 3] 321
  • 4] Cannot be determined
  • 5] None of these
Solution
5
Discuss

David obtained 76, 65, 82, 67 and 85 marks (out of 100) in English, mathematics, physics, chemistry and biology. What are his average marks?

  • 1] 65
  • 2] 69
  • 3] 75
  • 4] None of these
Solution
6
Discuss

The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% a mean score of 31. The mean score of remaining 55% is-

  • 1] 45
  • 2] 50
  • 3] 51.4 approx
  • 4] 54.6 approx
Solution
7
Discuss

Mukesh has twice as much money as Soham. Soham has 50% more money than Pankaj. If the average money with them is Rs. 110, then Mukesh has :

  • 1] Rs. 155
  • 2] Rs. 160
  • 3] Rs. 180
  • 4] Rs. 175
Solution
8
Discuss

The average of first five multiples of 3 is:

  • 1] 9
  • 2] 10
  • 3] 8
  • 4] 11
Solution
9
Discuss

Amount five people with monthly income (in Rs.) 15000, 26000, 16000, 19000, 50000, how many will have income less than the mean income of five people?

  • 1] 1
  • 2] 2
  • 3] 3
  • 4] 4
Solution
10
Discuss

The average expenditure of a man for the first five months is Rs. 1200 and for the next seven months is Rs. 1300. If he saves Rs. 2900 in that year, his monthly average income is-

  • 1] Rs. 1500
  • 2] Rs. 1600
  • 3] Rs. 1700
  • 4] Rs. 1400
Solution
# Quiz