2971 . The average age of 15 people is 25 years. Out of them, total age of 2 people is 115 years. What is the average age of the other 13 people?

A. 20 years
B. 25 years
C. 22.5 years
D. 57.5 years
E. None of these

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Answer: Option A

Explanation:

Total age of 15 people = 15 x 25 = 375 years

Total age of 2 people = 115 years

Total age of the other 13 people = 275 - 115 = 160

So, the average age of the other 13 people = 160/13 = 20 years

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2972 . The average age of 40 employees in abranch of a bank is 35 years. When a new employee joined the bank the average age increased to 35.5 years. What is the age of the new employee?

A. 55.5
B. 50
C. 50.5
D. 20.5

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Answer: Option A

Explanation:

Total age of 40 employees = 40×35 = 1400 years

Total age of 41 employees = 41×35.5 = 1455.5 years

Age of the new employee = 1455.5 - 1400 = 55.5 years

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2973 . The average age of 8 men is increased by 2 years when one of them whose age is 24 years is replaced by a woman. What is the age of the woman ?

A. 35 years
B. 28 years
C. 32 years
D. 40 years

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Answer: Option D

Explanation:

মহিলাটির বয়স = 8 × 2 + 24

= 16 + 24

= 40 বছর

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2974 . The average age of A, B And C sis 30 years. If the difference between B's age and A's age is same as the difference between C's age and B's age . If D is 40 years older than B then what is the sum of the age B and D?

A. 130 years
B. 60 years
C. 75 years
D. 100 years

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Answer: Option D

Explanation:

ATQ, B - A = C - B

= > 2B = A + C

Now, A + B + C = 30 x3 = 90

= > B + (A + C) = 90

= > B + 2B = 90

= > 3B = 90 :: B = 30

D's age = 30 + 40 = 70

B + D = 70 + 30 = 100 (Ans) .

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Officer (General) |-Sonali | Janata | Bangladesh Krishi_Bangladesh Development bank ২৪.০৫.২০১৯

A. 48
B. 46
C. 42
D. 45

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Answer: Option B

Explanation:

A + B + C + D + E = 40 × 5 = 200
A + B = 35 × 2 = 70
C + D = 42 × 2 = 84
Therefore,
E = (A + B + C + D + E) - (A + B + C + D)
E = 200 - 70 - 84
E = 46 years.

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অফিসার (ক্যাশ ) - Sonali | Rupali | BD Krishi | Rajshahi Krishi Unnayn | Investment Corporation Of Bangladesh - ২৯. ০৩.২০১৯

A. 22 years
B. 30 years
C. 40 years
D. 32 years

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Answer: Option D

Explanation:

দেওয়া আছে, 10 জন ছাত্রের গড় বয়স = 20

∴ 10 জন ছাত্রের গড় বয়স = 10 × 20

= 200 বছর

আবার, 2 জন নতুন ছাত্র আসার পর ,

12 জন ছাত্রের গড় বয়স = (20+2) বছর

∴ 12 জন ছাত্রের মোট বয়স = (12 × 22 ) বছর

নতুন ২ জন ছাত্রের মোট বয়স = (264 - 200)

= 64 বছর

∴ 2 জন ছাত্রের গড় বয়স = 64/2 = 32 বছর

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First Security Islami Bank Ltd | Probationary Officer | 19-02-2021

A. 16
B. 17
C. 18
D. 19

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Answer: Option C

Explanation:

Let the sum of 5 new student’s age is x

Then according to question,

(150 + x)/15 = 16

= )150 + x = 240

= )x = 90

Average of their ages = sum/number

= )90/5 = 18

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2978 . The average age of a group of 15 employees is 24 years. If 5 more employees join the group, the average age increases by 2 years. Find the average age of the new employees.

A. 35
B. 30
C. 24
D. 32

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Answer: Option D

Explanation:

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Officer (Cash) -Sonali Bank | BD Development | BD Krishi Bank - 12.10.2018

A. 35years
B. 40years
C. 45years
D. 50years
E. None of these

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Answer: Option B

Explanation:

3 years ago their average age was = 27 years

At present their average age = ( 27 + 3) = 30 years

At present the summation of their age = 30×3 = 90 years

Again,

5 years ago, the average age of child and wife was = 20 years

At present their average age = 20 + 5 = 25 years.

At present the summation of their age = 25×2 = 50 years

So, at present the husbands age = 90 - 50 = 40 years

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2980 . The average age of husband,wife and their child 3years ago was 27 years and that of wife and the child 5years ago was 20years.The present age of husband is :

A. 35years
B. 40years
C. 45years
D. 50years

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Answer: Option B

Explanation:

The total of the present ages of husband, wife and child = 3 x 27 + 3 x 3 = 90 years

The total of the present ages of wife and child = 2 x 20 + 2 x 5 = 50 years

So, the present age of the husband = 90 - 50 = 40 years

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2981 . The average age of the 20 aspirants of a class is 19.2 years. After some time two more aspirants join them and then average is increased by 0.3 years. Find the difference between the age of new aspirants .

A. 12
B. 15
C. 18
D. None of these

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Answer: Option D

Explanation:

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জনতা ও রূপালী ব্যাংক- অফিসার ১৩.১২.২০১৯

A. 25 years
B. 30 years
C. 28 years
D. 32 years

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Answer: Option B

Explanation:

মনে করি,

তিনজনের গড় বয়স ২৪

অতএব, ৩ জনের মোট বয়স ২৪*৩=৭২

দেওয়া আছে,

১ জনের বয়স ২১ বছর হলে, ২ জনের বয়স ২১*২=৪২

মনে করি,

১ জনের বয়স সর্বোচ্চ ক ববছর

প্রশ্নমতে,

২১*২+ক= ২৪*৩

বা, ৪২+ক=৭২

বা, ক=৭২-৪২

বা, ক =৩০

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2983 . The average age of three persons is 30 years. If the ratio of three ages is 3 : 5 : 7. What is the age of the youngest person?

A. 18 years
B. 8 years
C. 16 years
D. 42 years

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Answer: Option A

Explanation:

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2984 . The average attendance of a college for the first three days of a week is 325 and first four days is 320. How many were present on the fourth day?

A. 300
B. 315
C. 305
D. 350

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Answer: Option C

Explanation:

4th days attendance = (320×4 - 325×3)

= 1280 - 975 = 305

Ans.

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Officer (General) |-Sonali | Janata | Bangladesh Krishi_Bangladesh Development bank ২৪.০৫.২০১৯

A. 1044
B. 2088
C. 720
D. 324

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Answer: Option B

Explanation:

Total cost of 5 apples & 4 mangoes = 324 tk

Total cost of 7 apples & 8 mangoes = 720 tk

( + ) Total cost of 12 apples & 12 mangoes = 1044 tk

Total cost of 24 apples & 12 mangoes = 1044 ×2 = 2088 tk

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Bangladesh Bank - Assistant Director - 2009

2971 . The average age of 15 people is 25 years. Out of them, total age of 2 people is 115 years. What is the average age of the other 13 people?

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2972 . The average age of 40 employees in abranch of a bank is 35 years. When a new employee joined the bank the average age increased to 35.5 years. What is the age of the new employee?

2973 . The average age of 8 men is increased by 2 years when one of them whose age is 24 years is replaced by a woman. What is the age of the woman ?

2974 . The average age of A, B And C sis 30 years. If the difference between B's age and A's age is same as the difference between C's age and B's age . If D is 40 years older than B then what is the sum of the age B and D?

2975 . 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 of C and D is 42 years. Age of E is -

2976 . The average age of a group o f10 students was 20. The average age increased by 2 years when two new students joined the group students who joined the group?

2977 . The average age of a group of 10 students is 15 years . when 5 more students joined the group , the average age rise by 1 year. what is average age of the newly joined students?

2978 . The average age of a group of 15 employees is 24 years. If 5 more employees join the group, the average age increases by 2 years. Find the average age of the new employees.

2979 . The average age of a husband, wife and their child 3 years ago was 27 years and the average age of the wife and the child 5 years ago was 20 years. What is the percent age of the husband?

2980 . The average age of husband,wife and their child 3years ago was 27 years and that of wife and the child 5years ago was 20years.The present age of husband is :

2981 . The average age of the 20 aspirants of a class is 19.2 years. After some time two more aspirants join them and then average is increased by 0.3 years. Find the difference between the age of new aspirants .

2982 . The average age of the three is 24 years. If none of them is below 21 years of age then what is the maximum age of any of them?

2983 . The average age of three persons is 30 years. If the ratio of three ages is 3 : 5 : 7. What is the age of the youngest person?

2984 . The average attendance of a college for the first three days of a week is 325 and first four days is 320. How many were present on the fourth day?

2985 . The average cost of 5 apples and 4 mangoes is 36 taka. The average cost of 7 apples and 8 mangoes is 48 taka. Find the total cost of 24 apples and 24 mangoes.

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