Average problems
- 1. When all the students in a school are made to stand in rows of 54, 30 such rows are formed. If the students are made to stand in rows of 45, how many such rows will be formed ?
Options- A. 22
- B. 36
- C. 32
- D. 26 Also asked in: GRE, GATE, CAT, Bank Exams, AIEEE, Bank PO, Bank Clerk
Correct Answer: 36
Explanation:
Total number of students = 54 x 30
When arranged in rows of 45, number of rows formed are,
= 36.
- 2. The average of a non-zero number and its square is 11 times the number. The number is ?
Options- A. 22
- B. 21
- C. 11
- D. 17 Also asked in: GATE, CAT, Bank Exams, Bank Clerk
Correct Answer: 22
Explanation:
Let the number be 'x'.
= 11x
= 22x
=> x = 22.
- 3. In a cinema hall for the matinee show which started at 2.30 pm and ended at 5.30 pm the vehicle parking lot had only three wheelers (auto rickshaws) and four wheelers. Today the wheels of the vehicles parked was counted and found to be 240. What could be the number of three wheelers parked therein ?
Options- A. 48
- B. 41
- C. 45
- D. 43 Also asked in: AIEEE, Bank Exams, CAT, Bank Clerk
Correct Answer: 48
Explanation:
3X + 4y = 240
by substitute through options 48 is correct
- 4. The mean deviation of the data 3, 10, 10, 4, 7, 10, 5 is :
Options- A. 49/7
- B. 19/7
- C. 50/7
- D. 18/7 Also asked in: Bank Exams
Correct Answer: 18/7
- 5. The average cost of 5 items in a shopping list is Rs 650. If one more item whose cost is Rs 1400 is added to the list what will be the new average (in Rs)?
Options- A. 775
- B. 875
- C. 725
- D. 825 Also asked in: Bank Exams
Correct Answer: 775
- 6. Sripad has scored average of 65 marks in three objects. In no subjects has he secured less than 58 marks. He has secured more marks in Maths than other two subjects. What could be his maximum score in Maths ?
Options- A. 79
- B. 77
- C. 76
- D. 73 Also asked in: AIEEE, Bank Exams, CAT, GATE, GRE, Analyst, Bank Clerk, Bank PO
Correct Answer: 79
Explanation:
Assuming Sripad has scored the least marks in subject other than science,
Then the marks he could secure in other two are 58 each.
Since the average mark of all the 3 subject is 65.
i.e (58+58+x)/3 = 65
116 + x = 195
x = 79 marks.
Therefore, the maximum marks he can score in maths is 79.
- 7. The average age of the district level hockey team of eleven is 22 years.The average age gets increased by 1 year when the coach age is also included.what is the age of the coach ?
Options- A. 33 yrs
- B. 34 yrs
- C. 35 yrs
- D. 36 yrs Also asked in: AIEEE, Bank Exams, CAT, GATE, Bank Clerk, Bank PO
Correct Answer: 34 yrs
Explanation:
Total age of players in team = 22 x 11 = 242
When coach is included, total members = 12, Avg age increases by one becomes 23
Total age when coach is included = 23x12 = 276
Age of coach = 276-242 = 34 yrs.
- 8. The average weight of a group of boys is 30 kg. After a boy of weight 35 kg joins the group, the average weight of the group goes up by 1 kg. Find the number of boys in the group originally ?
Options- A. 6
- B. 8
- C. 4
- D. 5 Also asked in: AIEEE, Bank Exams, CAT, Bank Clerk, Bank PO
Correct Answer: 4
Explanation:
Let the number of boys in the group originally be x.
Total weight of the boys = 30x
After the boy weighing 35 kg joins the group, total weight of boys = 30x + 35
So 30x + 35 + 31(x + 1) = > x = 4.
- 9. The average marks of 40 students in an examination was 34. It was later found that the marks of one student had been wrongly entered as 62 instead of 26. what is the correct average?
Options- A. 33.1
- B. 33.3
- C. 33.5
- D. 33.7 Also asked in: Bank Exams
Correct Answer: 33.1
- 10. What is the average of first 19 odd numbers?
Options- A. 9.5
- B. 15.5
- C. 19
- D. 38 Also asked in: Bank Exams
Correct Answer: 19
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