Average (SSC) (Part-7)

Total Questions: 27

1. The average time taken by 7 athletes in a race is 2 minutes 10 seconds. If the winner completed the race in 1 minute 40 seconds, then the average time taken by the other athletes: [SSC MTS 13/10/2021 (Afternoon)]

Correct Answer: (c) 2 minutes 15 seconds
Solution:


2. The average age of a group of students in a class is 15.5 years. 15 new students with an average age of 14.5 years join the group, due to which the average age of students in the class becomes 15 years. The number of students initially present in the class is: [SSC MTS 13/10/2021 (Evening)]

Correct Answer: (d) 15
Solution:

3. The average of a, b and c is 8 less than d. If the average of a, b, c and d is 42, then what is the average of (3d − 2) and (d + 5)? [SSC MTS 14/10/2021 (Afternoon)]

Correct Answer: (b) 97.5
Solution:

4. The average weight of 30 boys is more than average weight of 20 girls by 5 kg. If the total weight of 30 boys is 1050 kg, then the total weight (kg) of 20 girls is: [SSC MTS 18/10/2021 (Morning)]

Correct Answer: (d) 600
Solution:

5. While listing N consecutive even numbers for determining their average, the last number by mistake, got replaced by the next odd number and thereby the average turned out to be more than the desired value by 0.0125. What is the value of N? [SSC MTS 18/10/2021 (Evening)]

Correct Answer: (a) 80
Solution:

6. The average of a number and its reciprocal is 1. What is the average of its square, cube and fourth power? [SSC MTS 18/10/2021 (Evening)]

Correct Answer: (b) 1
Solution:

7. The average of ¼ of A and ⅓ of B is 5, and the average of ½ of A and ½ of B is 9. The average of 2A and 3B is : [SSC MTS 22/10/2021 (Afternoon)]

Correct Answer: (a) 42
Solution:


8. In a group of 108 persons, the ratio of the number of males and females is 5 : 4. The average height of the males is 158.7 cm and that of females is x cm. If the average height of all the persons in the group is 155.5 cm, then the value of x is: [SSC MTS 27/10/2021 (Afternoon)]

Correct Answer: (a) 151.5
Solution:

9. Let x and y be two positive numbers such that x > y. The average of 50% of x and 30% of y is 34.5. If the difference between x and y is 10, then the average of x and y is: [SSC MTS 27/10/2021 (Evening)]

Correct Answer: (a) 85
Solution:

10. The average of ten numbers is A. If c is subtracted from each number, except the tenth and (c − 1) is subtracted from the tenth number, then what will be the new average? [SSC MTS 2/11/2021 (Evening)]

Correct Answer: (a) A − c + 0.1
Solution: