AVERAGE MCQ SET 4
1. The average of three – digit numbers 325 , 2×5 , x35 , 63x and 406 is 411 , then find the average of x – 1 , x – 3 , x + 3 and x + 5 ?
(a) 6
(b) 3
(c) 4
(d) 5
Answer: D
2. If numbers 2 , 3 , 4 and 5 occur (2 + 5k) , (5k – 7) , (2k – 3) and (k + 2) times , respectively . The average of the numbers is 2.85 . Later on , the number 2 was replaced by 6 in all the places . What is the average of the new number ?
(a) 2.4
(b) 3.84
(c) 5.25
(d) 4.75
Answer: C
3. Average of the number a , b , c and d is 2d + 4 . Also , the average of the numbers a and b , b and c , c and d are 8 , 5 and 4 respectively . If e = a + d – 1 , then what is the average of the number d and e ?
(a) 3
(b) 8
(c) 8.5
(d) 7
Answer: D
4. The average of two numbers is 46 . Together with a third number , the combined average of three numbers changes to 43 . What is the third number ?
(a) 40
(b) 35
(c) 37
(d) 38
Answer: C
5. The average weight of 49 students is 53 kg . When a new student is admitted to the class , the average decrease by 500 g . Find the weight of the new students .
(a) 48 kg
(b) 18 kg
(c) 28 kg
(d) 38 kg
Answer: C
6. Average weight of 20 persons is 60 kg . A new person joins the group and average weight of 21 persons becomes 59 kg . What will be the weight of new person ?
(a) 41 kg
(b) 29 kg
(c) 39 kg
(d) 40 kg
Answer: C
7. Ram has an average score of 65 runs in 19 innings in cricket matches . Find out how many runs are to be scored by him in the 20th innings to raise the average score to 67 .
(a) 135
(b) 105
(c) 115
(d) 195
ย Answer: B
8. The average of the ages of a group of 65 men in 32 years . If 5 men join the group , the average of the ages 70 men is 34 years . Then the average of the ages of those 5 men joined later (in years) is :
(a) 50
(b) 55
(c) 65
(d) 60
Answer: D
9. The average age of 120 members of a society is 62.5 members , the average age of newly joined member’s is :
(a) 40 years
(b) 41 years
(c) 39 years
(d) 42 years
Answer: B
10. The average age of a class of 6 girls is x years .ย Four new girls having ages x – 2 , x + 4 , x + 8 and x + 10 joins the class . What is the new average age of the class ?
(a) x – 2
(b) x + 2
(c) x + 5
(d) x + 1
Answer: B
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