Discussion
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- Question
- In a class, there are 20 boys whose average age is decreased by 2 months, when one boy aged 18 years is replaced by a new boy. The age of the new boy is?
Options- A. 14 years 8 months
- B. 15 years
- C. 16 years 4 months years
- D. 17 years 10 months years
- Correct Answer
- 14 years 8 months
ExplanationTotal decrease
= ( 20 X 2 ) months
= 3 years 4 month
? Age of the new boy
= ( 18 years ) ? ( 3 years 4 months)
= 14 years 8 month - 1. The average age of an adult class is 40 years. 12 new students with an average age of 32 years join the class. Therefore decreasing the average by 4 year. what was the original strength of class?
Options- A. 10
- B. 11
- C. 12
- D. 15 Discuss
- 2. The average of the daily income of A, B and C is Rs . 60 . If B earns Rs . 20 more than C and A earns double of what C earns. What is the daily income of C?
Options- A. Rs. 70
- B. Rs. 60
- C. Rs. 40
- D. None of these Discuss
- 3. The average weight of 8 persons is increased by 2.5 kg, when one of them whose weight is 56 kg is replaced by a new man. The weight of the man is?
Options- A. 66 kg
- B. 75 kg
- C. 76 kg
- D. 86 kg Discuss
- 4. The average weight of 19 students is 15kg. by the admission of a new student the average weight is reduced to 14.8 kg. the weight of the new student is?
Options- A. 10.6 kg
- B. 10.8 kg
- C. 11 kg
- D. 14.9 kg Discuss
- 5. The average weight of A, B, C is 45kg. if the average weight of A and B be 40 kg and that of B and C be 40kg and that of B and C be 43kg, then the weight of B is?
Options- A. 17kg
- B. 20kg
- C. 26kg
- D. 31kg Discuss
- 6. Average monthly income of a family of 4 earning members was Rs. 735. One of the earning members died and therefore, the average income came down to Rs 650. The income of the deceased was?
Options- A. Rs. 692.80
- B. Rs. 820
- C. Rs. 990
- D. Rs. 1385 Discuss
- 7. The average age of 24 students in a class is 10. If the teacher's age is included, the average increase by one . The age of the teacher is?
Options- A. 25 year
- B. 30 year
- C. 35 year
- D. 40 year Discuss
- 8. The average expenditure of a man for the first five month is Rs. 120 and for the next seven months it is Rs . 130. if he saves Rs 299 in that year, his monthly average income is?
Options- A. Rs. 140
- B. Rs. 150
- C. Rs. 160
- D. Rs. 170 Discuss
- 9. The average salary of 20 workers in an office id Rs. 1900 per month . If the manger's salary is added , the average salary become Rs. 2000 p.m what is the manager's annual salary?
Options- A. Rs. 24000
- B. Rs. 25200
- C. Rs. 45600
- D. None of these Discuss
- 10. The average of 6 observation is 12. A new 7th observation is included and the new average is decrease by 1 , the seventh observation is?
Options- A. 1
- B. 3
- C. 5
- D. 6 Discuss
Average problems
Search Results
Correct Answer: 12
Explanation:
Let original strength = y
Then , 40y + 12 x 32 = ( y + 12) x 36
? 40y + 384 = 36y + 432
? 4y = 48
? y = 12
Correct Answer: Rs. 40
Explanation:
Let C's earning = Rs. y.
Then, B's earning = Rs. (y + 20)
and A's earning = Rs. 2y
? 2y + y + 20 + y= 3 x 60
? 4x = 160
? x = 40
Correct Answer: 76 kg
Explanation:
Total Increase = 8 x 2.5 = 20 kg.
weight of new man = (56 + 20) kg = 76 kg
Correct Answer: 11 kg
Explanation:
Weight of new student = Total weight of all 20 students - Total weight of initial 19 students
= (20 x 14.8 - 19 x 15) kg
= 11 kg.
Correct Answer: 31kg
Explanation:
weight of (A + B ) = (2 X 40 ) Kg = 80 kg
weight of (B + C ) = (2 X 43) kg = 86 kg
weight of (A + 2B +C ) = (80 + 86) kg = 166 kg
weight of (A + B + C ) = (3 X 45) kg = 135 kg
weight of B = (166-135) kg = 31 kg
Correct Answer: Rs. 990
Explanation:
Income of the deceased = Total income of 4 members - total income of remaining 3 members.
= 735 x 4 - 650 x 3 Rs.
= 990 Rs.
Correct Answer: 35 year
Explanation:
Age of the teacher = Sum of age of 24 students and teacher - Sum of age of 24 students.
= 25 x 11 - 24 x 10
= 35 years.
? Age of teacher = 35 years.
Correct Answer: Rs. 150
Explanation:
Total income = total expenditure + total saving
= Rs. (120 X 5 + 130 X 7 + 290)
=Rs. 1800
Average monthly income
=1800 / 12
=150 Rs.
Correct Answer: None of these
Explanation:
Manager's salary per month
= Rs. ( 21 x 2000 - 20 x 1900 )
= Rs. 4000
? Manager 's annual salary
= Rs. (4000 X 12 ) = Rs. 48000.
Correct Answer: 5
Explanation:
Seventh observation = sum of 7 observations - sum of 6 observations = 7 x 11 ? 6 x 12
= 5
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