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- Question
The average of 5 members of a family is 24 years. If the youngest member is 8 years old, then what was the average age (in years) of the family at the time of the birth of the youngest member?
Options- A. 16
- B. 20
- C. 24
- D. 30
- Correct Answer
- 20
- 1. The average of X, Y, Z is 24. Also, X:Y = 2:3 and X+Y = 60, then find the value of (X-Z)?
Options- A. 9
- B. 10
- C. 11
- D. 12 Discuss
- 2. In a class, there were 9 boys and some girls. In a test the mean score obtained by the boys was 12 while that obtained by the girls was 14. If the overall average was 13.1, what was the total number of students in the calss?
Options- A. 21
- B. 20
- C. 22
- D. 19 Discuss
- 3. Two students appeared for an examination. One of them secured 21 marks more than the other and his marks were 80% of the sum of their marks. The marks obtained by them are
Options- A. 88 and 67
- B. 89 and 68
- C. 28 and 7
- D. 98 and 77 Discuss
- 4. In a class there were 28 boys and some girls. In a test the mean score obtained by the boys was 12.5 while that obtained by the girls was 14.5. If the overall average was 13.1, what was the total number of students in the class?
Options- A. 42
- B. 44
- C. 40
- D. 38 Discuss
- 5. What is the average of first 7 multiples of 7?
Options- A. 7
- B. 14
- C. 28
- D. 21 Discuss
- 6. The average age of 120 members of a society is 60.7 years. By addition of 30 new members, the average age becomes 56.3 years. What is the average age (in years) of newly joined members?
Options- A. 36.5
- B. 37.2
- C. 38.3
- D. 38.7 Discuss
- 7. Starting with 8000 workers, the company increases the number of workers by 5%, 10% and 20% at the end of first, second and third year respectively. The number of workers in the fourth yearwas
Options- A. 10188
- B. 11088
- C. 11008
- D. 11808 Discuss
- 8. Average of 11 numbers is 7. If every number is doubled, then what will be the new average of the numbers?
Options- A. 3.5
- B. 7
- C. 10.5
- D. 14 Discuss
- 9. In a match, average of runs scored by 7 players is 53. If the runs scored by 6 players are 121, 40, 26, 56, 37 and 48, then how many runs did the 7th player scored?
Options- A. 26
- B. 37
- C. 43
- D. 48 Discuss
- 10. The average age of 24 students is 12 years. It was observed that while calculating the average age, the age of a student was taken as 14 years instead of 8 years. What will be the correct average age (in years)?
Options- A. 11.25
- B. 11.5
- C. 11.75
- D. 12.25 Discuss
Average problems
Search Results
Correct Answer: 12
Explanation:
X+Y+Z = 24*3 = 72 X:Y = 2:3 (Given)
Let ?X? to be 2a & ?Y? to be 3a
X+Y = 60 (Given)
2a+3a = 60
5a = 60
a = 12
Hence, X = 24 & Y = 36
From equation (1)...
Z = 72 - 60
Z = 12
Hence, X - Z = 24-12 = 12.
Correct Answer: 20
Correct Answer: 28 and 7
Correct Answer: 40
Correct Answer: 28
Correct Answer: 38.7
Correct Answer: 11088
Correct Answer: 14
Correct Answer: 43
Correct Answer: 11.75
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