The OSSSC LSI, Forester, FG Exam 2024 are crucial examinations that require a comprehensive understanding of various Arithmetic topics. To help aspirants prepare effectively, we have compiled a set of 30 competitive-level Arithmetic MCQs covering a wide range of subjects.
Top 30 MCQs Arithmetic for OSSSC LSI, Forester, FG 03 February 2024
These 30 General Studies Multiple Choice Questions cover a diverse range of topics relevant to the OSSSC LSI, Forester, FG Exam 2024. Use these questions as a tool to assess your knowledge and enhance your preparation for the upcoming examination. Remember to review the explanations and expand your understanding of each topic to ensure a well-rounded preparation. Best of luck!
1. The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 23. The orrected new mean is ?
a. 35
b. 36.5
c. 40
d. 42
Answer: b. 36.5
2. The average weight of a class of 24 students is 35 kg. If the weight of the teacher be included, the average rises by 400 g. The weight of the teacher is ?
a. 45 kg
b. 46 kg
c. 47 kg
d. 48 kg
Answer: a. 45 kg
3. The average age of 8 men is increased by years when two of them whose ages are 21 years and 23 years are replaced by two new men. The average age of the two new men is ?
a. 20
b. 30
c. 40
d. 50
Answer: b. 30
4. The average of runs of a cricket player of 10 innings was 32. How many runs must he make in his next innings so as to increase his average of runs by 4 ?
a. 76
b. 79
c. 85
d. 87
Answer: a. 76
5. The average age of 36 students in a group is 14 years. When teacher’s age is included to it, the average increases by one. What is the teacher’s age in years ?
a. 35 years
b. 45 years
c. 51 years
d. 54 years
Answer: c. 51 years
6. A library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is ?
a. 285
b. 290
c. 297
d. 305
Answer: a. 285
7. In a class of 78 students 41 are taking French, 22 are taking German. Of the students taking French or German, 9 are taking both courses. How many students are not enrolled in either course ?
a. 6
b. 12
c. 24
d. 18
Answer: c. 24
8. The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is ?
a. 35
b. 36.5
c. 40
d. 42
Answer: b. 36.5
9. The average weight of 8 persons increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person ?
a. 70 kg
b. 75 kg
c. 80 kg
d. 85 kg
Answer: d. 85 kg
10. The average of 11 numbers is 10.9. If the average of the first six numbers is 10.5 and that of the last six numbers is 11.4, then the middle number is ?
a. 10.5
b. 11.5
c. 12.5
d. 13.5
Answer: b. 11.5
11. The average of 11 results is 50. If the average of the first six results is 49 and that of the last six is 52, the sixth no. is ?
a. 48
b. 50
c. 52
d. 56
Answer: d. 56
12. The average per day income of A, B and C is 450. If the average per day income of A and B be 400 and that of B and C be 430, the per day income of B is ?
a. 300
b. 310
c. 415
d. 425
Answer: b. 310
13. The average of three numbers is 77. The first number is twice the second and the second number is twice the third. The first number is ?
a. 33
b. 66
c. 77
d. 132
Answer: d. 132
14. The average of 10 numbers is calculated as 15. It is discovered later on that while calculating the average one number, namely 36, was wrongly read as 26. The correct average is ?
a. 20
b. 18
c. 16
d. 14
Answer: c. 16
15. The average of 27 numbers is 60. If one number is changed from 28 to 82, the average is ?
a. 56
b. 58
c. 62
d. 64
Answer: c. 62
16. A cricketer has a mean score of 60 runs in 10 innings. Find out how many runs are to be scored in the eleventh innings to raise the mean score to 62 ?
a. 83
b. 82
c. 80
d. 81
Answer: b. 82
17. The average marks obtained by 40 students of a class is 86. If the 5 highest marks are removed, the average reduces by one mark. The average marks of the top 5 students is ?
a. 92
b. 96
c. 93
d. 97
Answer: c. 93
18. The average of l0 items was found to be 80 but while calculating, one of the items was counted as 60 instead of 50. Then the correct average would have been ?
a. 69
b. 79.25
c. 79
d. 79.5
Answer: c. 79
19. Average weight of 25 persons is increased by 1 kg when one man weighing 60 kg is replaced by a new person. Weight of new person is ?
a. 50 kg
b. 61 kg
c. 86 kg
d. 85 kg
Answer: d. 85 kg
20. The mean of 20 items is 55. If two items 45 and 30 are removed, the new mean of the remaining items is ?
a. 65.1
b. 65.3
c. 56.9
d. 56
Answer: c. 56.9
21. A cricket player after playing 10 tests scored 100 runs in the 11th test. As a result, the average of his runs is increased by 5. The present average of runs is ?
a. 45
b. 40
c. 50
d. 55
Answer: c. 50
22. Average weight of 25 students of a class is 50 kg. If the weight of the class teacher is included, the average is increased by 1 kg. The weight of the teacher is ?
a. 76 kg
b. 77 kg
c. 74 kg
d. 75 kg
Answer: a. 76 kg
23. The average age of 14 girls and their teacher’s age is 15 years. If the teacher’s age is excluded,the average reduces by 1. What is the teacher’s age ?
a. 35 years
b. 32 years
c. 30 years
d. 29 years
Answer: d. 29 years
24. 30 pens and 75 pencils altogether were purchased for 510. If the average price of a pencil was 2, what was the average price of a pen ?
a. 9
b. 10
c. 11
d. 12
Answer: d. 12
25. 12 kg of rice costing 30 per kg is mixed with 8 kg of rice costing 40 per kg.The average per kg price of mixed rice is ?
a. 38
b. 37
c. 35
d. 34
Answer: d. 34
26. The average of 30 numbers is 12.The average of the first 20 of them is 11 and that of the next 9 is 10. The last number is ?
a. 60
b. 45
c. 40
d. 50
Answer: d. 50
27. Average income of ‘A’ and ‘B’ is 200 and average income of ‘C’ and ‘D’ is 250. The average income of A, B, C and D is ?
a. 106.25
b. 125
c. 200
d. 225
Answer: d. 225
28. The average of three numbers is 28, the first number is half of the second, the third number is twice the second, then the third number is ?
a. 48
b. 36
c. 24
d. 18
Answer: a. 48
29. The average of seven numbers is 18. If one of the number is 17 and if it is replaced by 31, then the average becomes ?
a. 21.5
b. 19.5
c. 20
d. 21
Answer: c. 20
30. The average of runs scored by a player in 10 innings is 50. How many runs should he score in the 11th innings so that his average is increased by 2 runs ?
a. 80 runs
b. 72 runs
c. 60 runs
d. 54 runs
Answer: b. 72 runs
