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- Question
- The average age of A,B,C,D and E is 40 years.The average age of A and B is 35 years and the average age of C and D is 42 years .The age of E is
Options- A. 46
- B. 48
- C. 32
- D. none of these
- Correct Answer
- 46
ExplanationAge E = ( A + B + C + D + E ) - [ ( A + B ) + ( C + D ) ]
= ( 40 x 5 ) - [ ( 35 x 2 ) + ( 42 x 2 )]
=200 - ( 70 + 84)
= 200 - 154
= 46 - 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. Find the average of 308, 142, 160, 245 and 25.
Options- A. 176
- B. 178
- C. 175
- D. 174 Discuss
- 7. The average age of a group of 10 friends is 15 yr. If one friend leaves the group, the average becomes 16 yr. Find the age of the friend who left the group.
Options- A. 5 yr
- B. 4 yr
- C. 6 yr
- D. None of these Discuss
- 8. What is the average of first 79 natural numbers?
Options- A. 79
- B. 39
- C. 40
- D. 39.5 Discuss
- 9. The average of 8 number 21. if each of the number is multiplied by 8,the new set of number is?
Options- A. 8
- B. 21
- C. 29
- D. 168 Discuss
- 10. The average of 50 number is 38 .if two numbers 45 and 55 are discarded , the average of the remaining number is?
Options- A. 36.5
- B. 37.0
- C. 37.5
- D. 37.52 Discuss
Average problems
Search Results
Correct Answer: 48 km/hr
Explanation:
Average speed =2 x 40 x 60 / ( 40+ 60)
= 4800 / 100
= 48 km/hr
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
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.
Correct Answer: Rs. 3000
Explanation:
Average saving
= Average Income - Average Expenditure
= 8000 - 5000 = 3000
Correct Answer: Rs.7200
Explanation:
Required average salary
= ( 6000 x 2 + 8000 x 3) / (2 + 3 )
= 36000 / 5
= Rs. 7200
Correct Answer: 176
Explanation:
sum of observations
= 308 + 142 + 160 245 + 25 = 880
Average = Sum of all observations / Number of observations
=880 / 5
=176
Correct Answer: 6 yr
Explanation:
Age of friend left = Previous average of the age - Number of persons present x Increase in average age
= 15 - ( 10-1 ) x ( 16-15 )
= 15- 9 x 1
= 15 - 9 = 6yr
Correct Answer: 40
Explanation:
Average of first n natural numbers = ( n + 1 ) / 2
= ( 79 + 1 ) / 2
= 40
Correct Answer: 168
Explanation:
Average will increase by 8 times.
So average of new members = (21 x 8 ) = 168
Correct Answer: 37.5
Explanation:
Sum of 50 member = (50 x 38 )
= 1900
Sum of 48 member = [1900- (45 + 55 ) ]
= 1800
? Required Average = 1800/48
= 225/6
= 37.5
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