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- Question
What is the average of first 7 multiples of 7?
Options- A. 7
- B. 14
- C. 28
- D. 21
- Correct Answer
- 28
- 1. 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
- 2. 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
- 3. 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
- 4. The value of (2+32-3-342) is
Options- A. 36
- B. 336
- C. 49
- D. 49+3 Discuss
- 5. The average of runs scored by a cricketer in his 99 innings is 99. How many runs will he have to score in his 100th innings so that his average of runs in 100 innings may be 100?
Options- A. 100
- B. 99
- C. 199
- D. 101 Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Average problems
Search Results
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: 199
Correct Answer: 40
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
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