Quiz Discussion

Five years ago the average age of A, B, C, D was 45 years. By including X the present average of all the five is 49 years. Them the present age of X is-

Course Name: Quantitative Aptitude

  • 1] 40 years
  • 2] 45 years
  • 3] 48 years
  • 4] 64 years
Solution
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# Quiz
1
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
2
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
3
Discuss

Out of four numbers the average of the first three is 16 and that of the last three is 15. If the last number is 20, than first number is :

  • 1] 25
  • 2] 21
  • 3] 23
  • 4] 28
Solution
4
Discuss

The average weight of 21 boys was recorded as 64 kg. If the weight of the teacher was added, the average increased by 1 kg. What was the teacher’s weight?

  • 1] 86 kg
  • 2] 64 kg
  • 3] 72 kg
  • 4] 84 kg
Solution
5
Discuss

Nine persons went to a hotel for taking their meals. Eight of them spent Rs. 12 each on their meals and the ninth spent Rs. 8 more than the average expenditure of all the nine. What was the total money spent by them.

  • 1] Rs. 115
  • 2] Rs. 116
  • 3] Rs. 117
  • 4] Rs. 118
Solution
6
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
7
Discuss

The average age of the boys in a class is 16 years and that of the girls is 15 years. The average age for the whole class is-

  • 1] 15 years
  • 2] 15.5 years
  • 3] 16 years
  • 4] Cannot be computed with the given information
Solution
8
Discuss

The average of six numbers is x and the average of three of these is y. If the average of the remaining three is z, then-

  • 1] x = y + z
  • 2] 2x = y + z
  • 3] x = 2y + 2z
  • 4] None of these
Solution
9
Discuss

Four years ago, the average age of a family of four persons was 18 years. During this period, a baby was born. Today if the average age of the family is still 18 years, the age of the baby is

  • 1] 1.2 years
  • 2] 2 years
  • 3] 2.5 years
  • 4] 3 years
Solution
10
Discuss

The average of 9 observations was found to be 35. Later on, it was detected that an observation 81 was misread as 18. The correct average of the observation is -

  • 1] 28
  • 2] 42
  • 3] 32
  • 4] 45
Solution
# Quiz