Average (SSC)

Total Questions: 50

41. The average age of 120 students in a group is 13.56 years, 35% of the number of students are girls and the rest are boys. If the ratio of the average age of boys and girls is 6:5, then what is the average age (in years) of the girls? [SSC CGL Tier II (13/09/2019)]

1. (a) 12
2. (b) 11.6
3. (c) 10
4. (d) 14.4

Correct Answer: (a) 12

Solution:

42. The average of 18 numbers is 37.5. If six numbers of average x are added to them, then the average of all the numbers increases by one. The value of x is :: [SSC CGL Tier II (13/09/2019)]

1. (a) 40
2. (b) 41.5
3. (c) 42
4. (d) 38.5

Correct Answer: (b) 41.5

Solution:

43. The average weight of a certain number of students in a group is 72 kg. If 10 students having an average weight of 78 kg leave and 4 students having an average weight of 80 kg join the group, the average weight of the students in the group decreases by 0.7 kg. The number of students initially in the group is: [SSC CGL Tier II (12/09/2019)]

1. (a) 56
2. (b) 46
3. (c) 44
4. (d) 54

Correct Answer: (b) 46

Solution:

44. The average of 33 numbers is 74. The average of the first 17 numbers is 72.8 and that of the last 17 numbers is 77.2. If the 17th number is excluded, then what will be the average of the remaining numbers (correct to one decimal place)? [SSC CGL Tier II (12/09/2019)]

1. (a) 72.9
2. (b) 73.4
3. (c) 71.6
4. (d) 70.8

Correct Answer: (a) 72.9

Solution:

45. The owner of a bike buys petrol at the rate of Rs. 64, Rs. 80 and Rs. 320 per litre for three consecutive years. If he spends Rs. 32000 on petrol every year, then what is the average price (Rs.) of petrol per litre ? [SSC MTS 16/08/2019 (Evening)]

1. (a) 120
2. (b) 84
3. (c) 108
4. (d) 96

Correct Answer: (d) 96

Solution:

46. An art exhibition was held in the month of November. The numbers of visitors on weekdays and on weekends were 450 and 750 respectively. If the first day of the month was Monday, then what was the average number of visitors in the month? [SSC MTS 16/08/2019 (Evening)]

1. (a) 520
2. (b) 530
3. (c) 510
4. (d) 540

Correct Answer: (b) 530

Solution:

47. A person was asked to guess his own weight. He estimated his weight to be over 70 kg but less than 80 kg. His friend estimated his weight to be more than 74 kg but less than 84 kg. His mother said that his weight is less than 78 kg. Assuming that the weights are a whole number and that the three had correctly guessed, then what is the average of the possible weights (in Kg)? [SSC MTS 14/08/2019 (Morning)]

1. (a) 76.5
2. (b) 76
3. (c) 77
4. (d) 75

Correct Answer: (b) 76

Solution:

48. Out of four numbers the average of the first three is 16 and that of the last three is 15. If the last number is 21 then the first number is: [SSC MTS 13/08/2019 (Evening)]

1. (a) 28
2. (b) 22
3. (c) 21
4. (d) 24

Correct Answer: (d) 24

Solution:

49. The average of all the prime and composite numbers upto 100 is: [SSC MTS 9/08/2019 (Morning)]

1. (a) 51
2. (b) 50
3. (c) 50.5
4. (d) 49.5

Correct Answer: (a) 51

Solution:

50. What is the average of the first 15 whole numbers? [SSC MTS 08/08/2019 (Morning)]

1. (a) 8
2. (b) 7
3. (c) 9
4. (d) 10

Correct Answer: (b) 7

Solution:

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