Average problems
- 1. The average weight of Somdev, Gurdeep and Ritu is 85 kg. If the average weight of Somdev and Gurdeep be 79 kg and that of Gurdeep and Ritu be 73 kg, then the weight of Gurdeep is
Options- A. 78
- B. 49
- C. 72
- D. 90 Also asked in: AIEEE, Bank Exams, CAT
Correct Answer: 49
- 2. There were 35 studentsina hostel.Ifthenumber of studentsbe increased by 7, the expenditure on food increases by Rs 42 per day while the average expenditure of studentsis reduced by Rs 1. What was the initial expenditure on food per day?
Options- A. Rs 432
- B. Rs 442
- C. Rs 420
- D. Rs 400 Also asked in: Bank Exams
Correct Answer: Rs 420
Explanation:
Let the original avg expenditure be x
Total expenditure = 35x
?35x + 42 = (x-1) X 42
?35x + 42 = 42x ?42
?7x = 84
?x = 12
So, initial expenditure = 12 X 35 = 420
- 3. Average age of a team having 12 players is 23 years. If the age of the coach is also included, then the average age increases by 2 years. What is the age (inyears) of the coach?
Options- A. 41
- B. 47
- C. 49
- D. 51 Also asked in: Bank Exams
Correct Answer: 49
- 4. The average of 50 consecutive natural numbers is x. What will be the are average when the next four natural numbers are also included?
Options- A. x + 1
- B. x + 2
- C. x + 4
- D. x + (x/54) Also asked in: Bank Exams
Correct Answer: x + 2
Explanation:
Sum of n consecutive natural numbers = n(n+1)/2
Average of n consecutive natural numbers = (n+1)/2
For first 50 average = 51/2 = x
Last 50 average = 55/2 = x+2
- 5. The average weight of 100 students is 32 kg. The average weight of first 49 students is 30 kg and of last 50 students is 34 kg. What is the weight (in kg) of the 50th student?
Options- A. 25
- B. 30
- C. 32
- D. 33 Also asked in: Bank Exams
Correct Answer: 30
- 6. The average revenues of 9 consecutive years of a company is Rs 76 lakhs. If the average of first 5 years is Rs 71 lakhs and that of last 5 years is Rs 83 lakhs, find the revenue for the 5th year.
Options- A. Rs 88 lakhs
- B. Rs 84 lakhs
- C. Rs 86 lakhs
- D. Rs 82 lakhs Also asked in: Bank Exams, CAT
Correct Answer: Rs 86 lakhs
- 7. What is the average of all natural numbers from 21 to 39?
Options- A. 30
- B. 31
- C. 29
- D. 28 Also asked in: Bank Exams
Correct Answer: 30
- 8. What is the average of first 39 even numbers ?
Options- A. 39
- B. 40
- C. 20
- D. 68 Also asked in: Bank Exams
Correct Answer: 40
- 9. A batsman makes a score of 81 runs in the 16th match and thus increases his average runs per match by 3. What is his average after the 16th match?
Options- A. 35
- B. 34
- C. 33
- D. 36 Also asked in: Bank Exams
Correct Answer: 36
- 10. The average temperature of Monday ,Tuesday , Wednesday and Thursday is 60°, The average for Tuesday, Wednesday, Thursday and Friday is 63°; If the ratio of temperature for Monday and Friday is 21 : 25, then what is the temperature of Friday ?
Options- A. 70°
- B. 73°
- C. 75°
- D. 78° Also asked in: Bank Exams
Correct Answer: 75°
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