Average
| 6. | In a class, the average age of students is 11 years. The average age of the class increases by 1/4 years, if a 15 year old student joins the class. How many students were there in the class initially? |
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A. 12
B. 15
C. 18
D. 20
View Answer Discuss Work SpaceAnswer: option b
Explanation:
15 year old boy is contributing (15 - 11) = 4 yrs to himself and n other students.
=> (n + 1) x 0.25 = 4 => n = 15
Also, Refer Important Points for the method to solve such questions.
| 7. | The average weight in a class of 10 students increases by 3.5 kg when a teacher comes in place of one them weighing 65 kg. The weight of the teacher is: |
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A. 80 kg
B. 90 kg
C. 100 kg
D. 115 kg
View Answer Discuss Work SpaceAnswer: option c
Explanation:
Increase in student weight has come from teacher's weight.
So, weight of teacher = 3.5 x 10 + 65 = 100
| 8. | The average weight of 64 people in a group is 74 kg. If two new people come to the group, then the average is increased by 2 kg. Sum of the weights (in kg) of those new people is: |
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A. 320
B. 276
C. 280
D. 300
View Answer Discuss Work SpaceAnswer: option c
Explanation:
Two new people has contributed 2 kg to 64 people and brought (74 + 2) kg to themselves.
So, weight of 2 new people = (2 x 64) + 76 + 76 = 280
| 9. | The average weight of Arpit, Bhuvan and Chandu is 84 kg. If Dheeraj joins the group, the average weight of the group becomes 80 kg. If another person Elena who weights is 3 kg more than Dheeraj Replaces Arpit, Then the average of Bhuvan, Chandu, Dheeraj and Elena becomes 79 kg. What is the weight of Arpit? |
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A. 64
B. 72
C. 75
D. 90
View Answer Discuss Work SpaceAnswer: option c
Explanation:
| 10. | In an exam of 100 marks, the average marks of a class of 40 students is 76. If the top 3 scorers of the class leave, the average score falls down by 1. If the other two toppers except the highest one scored not more than 85, then what is the minimum score the topper can have? |
|---|
A. 86
B. 90
C. 95
D. 98
View Answer Discuss Work SpaceAnswer: option c
Explanation:
Average Questions and Answers FAQ
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