AVERAGE MCQ SET 6
1. The ages of four members of a family are in the year 2010 are ‘x’ , ‘x + 12’ , ‘x + 24’ and ‘x + 36 . After some years oldest among them was dead then average reduced by 3 . After how many years from his death , the average age will same as in 2010 ?
(a) 2 years
(b) 3 years
(c) 4 years
(d) 6 years
Answer: B
2. The average weight of 15 people increases by 3.2 kg when a new person comes in place of one of them weighing 52 kg . The weight of new person is:
(a) 96 kg
(b) 100 kg
(c) 52 kg
(d) 48 kg
Answer: B
3. The average weight of 15 persons is increased by 1.2 kg when one of them whose weight is 51 kg is replaced by a new man . The weight of the new man is :
(a) 69 kg
(b) 70 kg
(c) 65 kg
(d) 59 kg
Answer: A
4. The average weight of three men is increased by 4 kg when one of them , whose weight is 100 kg , is replaced by another man . What is the weight of the new man?
(a) 107 kg
(b) 103 kg
(c) 104 kg
(d) 112 kg
Answer: D
5. Out of 10 teachers of a school , one teacher retires and in place of him a new teacher who is 25 years old joins . As a result average age of the teachers reduces by 3 years . Age of the retired teacher (in yrs) is :
(a) 55
(b) 65
(c) 45
(d) 67
Answer: A
6. The average weight of 5 men decreases by 3 kg when one of them weighing 150 kg is replaced by another person . Find the weight of the new person .
(a) 125 kg
(b) 100 kg
(c) 120 kg
(d) 135 kg
Answer: D
7. The average age of a group is increased by 4 years when a person of whose age is 32 years was replaced by a person whose age is 56 . Find the number of people in the group .
(a) 6
(b) 7
(c) 8
(d) 9
ย Answer: A
8. A group of students has an average weight of 42 kg . One student of weight 48 kg leaves the group and another student of weight 44 kg joins the group . If the new average weight becomes 41.6 kg , then how many students are there in the group ?
(a) 15
(b) 10
(c) 8
(d) 12
Answer: B
9. The average weight of some persons in a group is 76 kg . If 15 persons with average weight 72 kg join the group or 5 persons with average weight 84 kg leave the group , the average weight of the persons in the group in both cases is the same . How many persons were there in the group , initially ?
(a) 50
(b) 30
(c) 45
(d) 25
Answer: C
10. There are some children in a camp and their average weight is 40 kg . Ifย 5 children with average weight of 36 kg join the camo or if 5 children with average weight 43.2 kg leave the camp , the average weight of children in both cases is equal . How many children are there in the camp , initially ?
(a) 35
(b) 45
(c) 40
(d) 50
Answer: B
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