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- Question
The average age of 80 boys in a class is 15. The average age of group of 15 boys in the class is 16 and the average of another 25 boys in the class is 14. What is the average age of the remaining boys in the class ?
Options- A. 12.24 yrs
- B. 13.25 yrs
- C. 16 yrs
- D. 15.25 yrs
- Correct Answer
- 15.25 yrs
ExplanationTotal ages of 80 boys = 15 x 80 = 1200 yrs.
Total age of 16 boys = 15 x 16 = 240 yrs
Total age of 25 boys = 14 x 25 = 350 yrs.
Average age of remaining boys = 1200 - (240+350) / 80 - (25+15) = 610/41 = 15.25 yrs. - 1. 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
- 2. The value of (2+32-3-342) is
Options- A. 36
- B. 336
- C. 49
- D. 49+3 Discuss
- 3. 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
- 4. The average of marks of 17 students in an examination was calculated as 71. But it was later found that the mark of one student had been wronglyentered as 65 instead of 56 and another as 24 instead of 50. The correct average is
Options- A. 70
- B. 71
- C. 72
- D. 73 Discuss
- 5. The mode of the data 12, 1, 10, 1, 9, 3, 4, 9, 7, 9 is
Options- A. 9
- B. 12
- C. 1
- D. 7 Discuss
- 6. What is the average of first 7 multiples of 7?
Options- A. 7
- B. 14
- C. 28
- D. 21 Discuss
- 7. 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
- 8. 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
- 9. 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
- 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
Problems on Ages
Search Results
Correct Answer: 70
Correct Answer: 49
Correct Answer: 199
Correct Answer: 72
Correct Answer: 9
Correct Answer: 28
Correct Answer: 40
Correct Answer: 28 and 7
Correct Answer: 20
Correct Answer: 20
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