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- Question
A group of boys has an average weight of 36 kg. One boy weighing 42 kg leaves the group and another boy weighing 30 kg joins the group. If the average now becomes 35.7 kg, then how many boys are there in the group?
Options- A. 30
- B. 32
- C. 40
- D. 56
- Correct Answer
- 40
- 1. The average marks in science subject of a class of 20 students is 68. If the marks of two students were misread as 48 and 65 of the actual marks 72 and 61 respectively, then what would be the correct average?
Options- A. 68.5
- B. 69
- C. 69.5
- D. 70 Discuss
- 2. What is the average of first 93 natural numbers?
Options- A. 45
- B. 46
- C. 47
- D. 49 Discuss
- 3. The average temperature for Monday, Tuesday, Wednesday and Thursday was 48° . The average temperature for Tuesday, Wednesday, Thursday and Friday was 52°, If the temperature on Monday was 42°, then the temperature on Friday was (in degrees)
Options- A. 58
- B. 56
- C. 52
- D. 50 Discuss
- 4. Due to a price hike of 20% , 4 kg less sugar is available for Rs. 120 . What is the initial price per kg of sugar ?
Options- A. Rs. 5 Kg
- B. Rs. 4 Kg
- C. Rs. 6 Kg
- D. Rs. 5.5 Kg Discuss
- 5. A canteen requires 56 kgs of rice for seven days . The quantity of rice required for the months of April and May together is
Options- A. 468 kg
- B. 488 kg
- C. 498 kg
- D. 508 kg Discuss
- 6. a, b and c are 3 values, such that a + b = 5, b + c = 7.5 and c + a = 8.5. What will be the average of these values?
Options- A. 1.5
- B. 3
- C. 3.5
- D. 4.5 Discuss
- 7. Seven friends spent Rs 14 each on a project and the eighth friend spent Rs 21 more than the average expenditure of all eight of them. What is the amount of total money (in Rs) spent by them?
Options- A. 133
- B. 136
- C. 141
- D. 155 Discuss
- 8. The ratio of number of boys and girls in a class is 2 : 3. The average weight of boys and girls in the class is 18 kg and 21 kg respectively. What is the average weight (in kgs) of all the boys and girls together?
Options- A. 99/5
- B. 101/5
- C. 109/6
- D. 96/5 Discuss
- 9. The average of 8 consecutive natural numbers is 38.5. What is the largest of these 8 numbers?
Options- A. 41
- B. 39
- C. 42
- D. 45 Discuss
- 10. Consider the following grouped frequency distribution: x f 0-10 8 10-20 12 20-30 10 30-40 p 40-50 9 If the mean of the above data is 25.2, then what is the value of p?
Options- A. 9
- B. 10
- C. 11
- D. 12 Discuss
Average problems
Search Results
Correct Answer: 69
Explanation:
Difference of marks = 72 + 61 ?48 ?65 = 20?Correct average marks = 68 +20/20= 69
Correct Answer: 47
Correct Answer: 58
Correct Answer: Rs. 5 Kg
Correct Answer: 488 kg
Correct Answer: 3.5
Correct Answer: 136
Correct Answer: 99/5
Correct Answer: 42
Correct Answer: 11
Explanation:
Mean = (sum of fixi/ (sum of f) = (8*5 + 12*15 + 10*25 + P*35 +9*45) / (8+12+10+P+9) = 25.2
(875 + 35P)/(39+P) = 25.2
P = 11
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