Quiz Discussion

The average of 20 students is 12 years, if the teacher's age is included, average increases by one. The age of the teacher is:

Course Name: Quantitative Aptitude

  • 1] 30 years
  • 2] 33 years
  • 3] 28 years
  • 4] 35 years
Solution
No Solution Present Yet

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# Quiz
1
Discuss

The average age of students of a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 15.4 years. The ratio of the number of boys to the number of girls in the class is-

  • 1] 1 : 2
  • 2] 2 : 3
  • 3] 3 : 4
  • 4] 3 : 5
Solution
2
Discuss

The average age of 40 students of class is 18 years. When 20 new students are admitted to the same class, the average age of the students of the class is increased by 6 months. The average age of newly admitted students is ?

  • 1] 19 years
  • 2] 19 years 6 months
  • 3] 20 years
  • 4] 20 years 6 months
Solution
3
Discuss

A batsman makes a score of 87 runs in the 17th inning and thus increases his average by 3. Find his average after 17th inning.

  • 1] 40
  • 2] 39
  • 3] 52
  • 4] 55
Solution
4
Discuss

The average weight of a class of 24 students is 35 kg. If the weight of the teacher be included, the average rises by 400 g. The weight of the teacher is -

  • 1] 45 kg
  • 2] 50 kg
  • 3] 53 kg
  • 4] 55 kg
Solution
5
Discuss

The average age of a family of 10 members is 20 years. If the age of the youngest member of the family is 10 years, then the average age of the members of the family just before the birth of the youngest member was approximately.

  • 1]

    27.14 years

  • 2]

    12.5 years

  • 3]

    14.28 years

  • 4]

    \(11\frac{1}{9}\) years

Solution
6
Discuss

The average age of a family with 5 members is 28. If one of the 5 members of age 20 is excluded the average age of the family becomes -

  • 1] 25
  • 2] 20
  • 3] 30
  • 4] 24
Solution
7
Discuss

Out of 20 boys, 6 are each of 1 m 15 cm height, 8 are of 1 m 10 cm and rest of 1 m 12 cm. The average height of all of them is :

  • 1] 1 m 12.1 cm
  • 2] 1 m 21.1 cm
  • 3] 1 m 21 cm
  • 4] 1 m 12 cm
Solution
8
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
9
Discuss

The average of runs of a cricket player of 10 innings was 32. How many runes must be made in his next innings so as to increase his average of runs by 4?

  • 1] 72
  • 2] 74
  • 3] 70
  • 4] 76
Solution
10
Discuss

The average of x number is y and average of y numbers is x. Then the average of all the numbers taken together is

  • 1]

    (x+y)/2xy

  • 2]

    2xy/(x+y)

  • 3]

    (x2+y2)/(x+y)

  • 4]

    xy/(x+y)

Solution
# Quiz