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- Question
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
- Correct Answer
- 40
- 1. What is the average of first 7 multiples of 7?
Options- A. 7
- B. 14
- C. 28
- D. 21 Discuss
- 2. The average age of 80 boys in a class is 15 years. The average age of a group of 15 boys in the class is 16 years and the average age of another 25 boys in the class is 14 years. What is the average age of the remaining boys in the class?
Options- A. 15.25 years
- B. 14 years
- C. 14.75 years
- D. Cannot be determined Discuss
- 3. The sum of a non-zero number and ten times its reciprocal is 7. Find the number.
Options- A. 4
- B. 3
- C. 5
- D. 6 Discuss
- 4. In a class of 65 students there are 39 girls. The average weight of these girls is 60 Kg and average weight of the full class is 64 kgs. What is the average weight of the boys of the class?
Options- A. 69
- B. 66
- C. 68
- D. 70 Discuss
- 5. The value of (2+32-3-342) is
Options- A. 36
- B. 336
- C. 49
- D. 49+3 Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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 Discuss
- 10. 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
Average problems
Search Results
Correct Answer: 28
Correct Answer: 15.25 years
Explanation:
Total sum of age of 80 students of the class = 15 X 80 = 1200 years
15 students ? 15 X 16 = 240 years
25 students ? 25 X 14 = 350 years
Sum of 40 students = 590 years
Total age of remaining 40 students = 1200 ? 590 = 610
So, average age = 15.25 years
Correct Answer: 5
Correct Answer: 70
Correct Answer: 49
Correct Answer: 28 and 7
Correct Answer: 20
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: 38.7
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