Average problems
- 1. The Average of 100, 200, 300, 400, ... , 1000 is 550. If each number is divided by 5, then the new average will be equal to
Options- A. 450
- B. 45
- C. 55
- D. None of these Discuss
Correct Answer: None of these
Explanation:
Actual average
=( 100 + 220 + 300 + ... + 1000 ) / 10
=550
New Average = 550 / 5
=110
- 2. A, B, C, D, E are the five electronic shops in the Naza market, which have 20, 30, 60, 80 and 50 T. V . sets with them respectively, then the average number of T. V. sets in each shop is
Options- A. 24
- B. 48
- C. 50
- D. 60 Discuss
Correct Answer: 48
Explanation:
Average number of T. V. sets
= ( 20 + 30 + 60 + 80 + 50 ) / 5
= 48
- 3. A, B, C, D, E, F are the only six families in Indira Nagar. A, B, C, D, E and F has 7, 8, 10, 13, 6, and 10 member in their families respectively. If 1 member from all the six families left their respective families to accommodate themselves in the hostel of IIM Lucknow, then the average number of member now in each family of Indira nagar is
Options- A. 8
- B. 9
- C. 10
- D. 13 Discuss
Correct Answer: 8
Explanation:
Required average
= (( 7 - 1 ) + ( 8 - 1 ) + ( 10 - 1 ) + ( 13 - 1 ) + (6 - 1) +( 10 - 1 ) )/ 6
= ( 7 + 8 +10 + 13 + 6 + 10 ) / 6 - ( 6 x 1 ) / 6
=9 - 1 = 8
- 4. The average number of shirts with Salman, Ambani and Dalmiya is 60, if all of them reached a shopping mall in Delhi and purchased 6 shirts each of them then average number of shirt each of them now has
Options- A. 66
- B. 63
- C. 62
- D. can't be determined Discuss
Correct Answer: 66
Explanation:
Required average
= Old average + New average
= 60 + 6 = 66
- 5. In a flower shop there were 6 flowers in each bouquet. If the seller has doubled the number of flowers in each bouquet then the new average of flowers in each bouque is
Options- A. 12
- B. 3
- C. 8
- D. none of these Discuss
Correct Answer: 12
Explanation:
Now required average
= old average x Multiplicand
= 6 x 2 = 12
- 6. The average salary of A, B is Rs. 6000 and that of C, D and E is Rs. 8000. The average salary of all the 5 people is
Options- A. Rs.7200
- B. Rs. 7000
- C. Rs. 7500
- D. can't be determined Discuss
Correct Answer: Rs.7200
Explanation:
Required average salary
= ( 6000 x 2 + 8000 x 3) / (2 + 3 )
= 36000 / 5
= Rs. 7200
- 7. The average salary of Rajesh, Bahadur and Amir is Rs. 8000 per month. The average expenditure of Rajesh , Bahadur and Amir per month is Rs. 5000. The average savings of all the 3 persons per month is
Options- A. Rs. 3000
- B. Rs. 5000
- C. Rs. 2500
- D. Rs. 9000 Discuss
Correct Answer: Rs. 3000
Explanation:
Average saving
= Average Income - Average Expenditure
= 8000 - 5000 = 3000
- 8. The average salary of A, B and C is Rs.10,000 and average expenditure of A is Rs. 6000 then the average savings of B and C is
Options- A. Rs. 5500
- B. Rs. 4500
- C. Rs. 4000
- D. can't be determined Discuss
Correct Answer: can't be determined
Explanation:
Total income = Total expenditure + Total savings
We are not find the average savings of B and C, Since data is insufficient.
- 9. The average salary of all the 60 employees in an office is Rs. 12,000 per month. if the number of executives is twice the number of non executives employees, then the average salary of all the non executives employees is
Options- A. Rs. 9000
- B. Rs. 8000
- C. Rs. 6000
- D. can't be determined Discuss
Correct Answer: can't be determined
Explanation:
No. of executives / No. of non- executives
= 2 / 1
Therefore
Number of executives = 40
and number of non executives employees = 20
now , go through the options
Total salary = 40 x salary of executives + 20 x salary of non-executives
60 x 12000 = 40 x k + 20 x l, here k, l are unknowns
so we con't determine the required average salary
- 10. Einstein goes from Ahmedabad To Lucknow at the speed of 40 km/hr and returned at the speed of 60 km/hr .the average speed of Einstein during the whole journey is
Options- A. 48 km/hr
- B. 24 km/hr
- C. 50 km/hr
- D. none of these Discuss
Correct Answer: 48 km/hr
Explanation:
Average speed =2 x 40 x 60 / ( 40+ 60)
= 4800 / 100
= 48 km/hr
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