421 . 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 -

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

প্রিমিয়াম প্ল্যান: ১ মাস

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সাবস্ক্রিপশন লিংক

422 . The average age of a family of 6 members is 25 years. After a 45- yers old member leves the family, what is the average age ( in years) of the family?

A. 22
B. 21
C. 20
D. 19

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Answer: Option B

Explanation:

6 জন সদস্যের সয়সের সমষ্টি = 6 × 25 = 150 বছর

5 বছর সদস্যের বয়সের সমষ্টি = 150 - 45 = 105 বছর

∴ বর্তমান বয়সের গড় = 105 = 21 বছর

সমন্বিত ৮ ব্যাংক | অফিসার | 21-01-2022

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

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Answer: Option D

Explanation:

The average age of a group of 15 employees is 24 years.
Therefore, the sum of the ages of all 15 of them = 15 * 24 = 360
When 5 more employees join the group, the average age increases by 2 years. New average = 26.
Now, there are 20 employees.
Therefore, the sum of the ages of all 20 of them = 20x26 = 520
Therefore, the sum of the ages of the 5 new students who joined = 520 - 360 = 160
And the average age of each of the 5 new students = 160/5 = 32 years.

Senior Officer- 8 Bank Recruitment Test 31-08-2018

A. log n
B. (n + 1)/2
C. (n -1) /2
D. n /2

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Answer: Option B

Explanation:

Sonali &amp-Janata Bank | Officer (IT)| 04.01.2019

A. 40.2
B. 40.4
C. 40.6
D. 40.8

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Answer: Option B

Explanation:

According to question,

Sum = (40.2 × 10 - 18 + 33 - 13) = 404

Correct Average = 404/10 = 40.4

বাংলাদেশ ব্যাংক || সহকারী পরিচালক 28-10-2022

A. 7.8
B. 9.8
C. 10
D. 12.4
E. 15

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Answer: Option E

Explanation:

The average of 6 numbers is 8.5

So, the sum of 6 numbers is 8.5x6 or 51

The average of 5 numbers is 7.2

So, the sum of 5 numbers is 7.2x5 or 36

So, the discarded number is 51 - 36 or 15

Normal 0 false false false EN - US X - NONE X - NONE

427 . The average of a series of consecutive odd numbers is 33. If there are 7 numbers in the series, what is the lowest number in the series ?

A. 25
B. 27
C. 29
D. 37
E. 39

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Answer: Option B

Explanation:

There are 3 numbers higher than 33 and 3 numbers lower than 33. Therefore, the lowest odd number will be 33 - 2 - 2 - 2 = 33 - 6 = 27.

Bangladesh Bank - Assistant Director - 2011

A. 25
B. 27
C. 30
D. 35

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Answer: Option D

Explanation:

429 . The average of nine numbers is 50. The average of the first five numbers is 54 and that of the last three numbers is 52. Then the sixth number is __

A. 30
B. 34
C. 44
D. 24

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Answer: Option D

Explanation:

The 6th number is = (50 × 9) – (5 × 54 + 3 × 52) = 450 – 426 = 24. Ans: D.

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

A. 72
B. 90
C. 93
D. 98
E. 86

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Answer: Option C

Explanation:

Hints:average mark = মোট 7 টি subject এর mark /7

science এর মার্ক = ( 7 × 75 - 6 × 72) = 93

431 . The average of the first and the second of three numbers is 15 more than the average of the second and the third of these numbers .what is the difference between the first and the third of these three numbers?

A. 15
B. 45
C. 60
D. None of these

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Answer: Option D

Explanation:

Let Ist no = x
2nd no = y
3rd no = z
According to Q.
(x + y)/2 = 15 + (y + z)/2
Multiply above equation by 2
x + y = 30 + y + z So,
x - z = 30 Difference of Ist & 3rd no is 30.

Officer (General) -Ansar VDP Unnayan | BD House Building Finance Corporation 28.09.2018

A. 3
B. 5
C. 7
D. 11

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Answer: Option C

Explanation:

According to the question,
⇒(x + y + z)/3 = 45
⇒x + y + z = 135.....(i)
⇒x = (y + z)/2 + 9
⇒2x−y−z = 18.....(ii)
x + y + z = 135
2x−y−z = 18
−−−−−−−−−−−− 3x = 153
x = 51
From (i)
y + z = 135 - 51 = 84.....(iii)
Also,
⇒(y + z)/2 = y + 2
⇒y + z = 2y + 4
⇒z−y = 4
+ y + z = 84
−y + z = 4
−−−−−−−−−
2z = 88
z = 44
Required difference = 51 - 44 = 7

433 . The average of the three numbers x , y and z is 45 , x is greater than the average of y and z by 9. The average of y and z is greater than y by 2 .Then the difference of x and z is:

A. 3
B. 5
C. 7
D. 11

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Answer: Option C

Explanation:

Senior Officer- 8 Bank Recruitment Test 31-08-2018

A. 76
B. 79
C. 85
D. 87

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Answer: Option A

Explanation:

সমন্বিত ৫ ব্যাংক | অফিসার ক্যাশ | 25-03-2022 ||

A. 38.5 Degree Celcius
B. 40.8 Degree Celcius
C. 41.3 Degree Celcius
D. 41.8 Degree Celcius

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Answer: Option D

Explanation:

Temperature on the fourth day
= [(40.2 × 4 + 41.3 × 4) - (40.6 × 7)]° C
= 41.8° C

NRBC Bank PLC || Trainee Assistant Officer (TAO) (26-10-2024) || 2024

421 . 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 -

422 . The average age of a family of 6 members is 25 years. After a 45- yers old member leves the family, what is the average age ( in years) of the family?

423 . The average are of a group of 15 employing is 24 years, If 5 more employees join the group., the average age increases by 2 years. Find the average age of the new employ?

424 . The average Number of key comparisons done in a successful sequential search in a list of length it is :

425 . The average of 10 numbers is 40.2. Later it is found that two numbers have been wrongly added. The first one is 18 greater than the actual number and the second number added is 13 instead of 33. Find the correct average-

426 . The average of 6 number is 8.5, when one number is discarded the average of the remaining numbers becomes 7.2. What is the discarded number?

427 . The average of a series of consecutive odd numbers is 33. If there are 7 numbers in the series, what is the lowest number in the series ?

428 . The average of five numbers is 27. If one number is excluded, the average becomes 24. The excluded numbers is:

429 . The average of nine numbers is 50. The average of the first five numbers is 54 and that of the last three numbers is 52. Then the sixth number is __

430 . The average of Selim’s marks in 7 subjects is 75. His average in six subjects excluding Science is 72. How many marks did he get in Science?

431 . The average of the first and the second of three numbers is 15 more than the average of the second and the third of these numbers .what is the difference between the first and the third of these three numbers?

432 . The average of the three numbers x, y, and z is 45. x greater than the average of y and z by 9. The average of y and z is grater than y by 2. Then the difference of x and z is:

433 . The average of the three numbers x , y and z is 45 , x is greater than the average of y and z by 9. The average of y and z is greater than y by 2 .Then the difference of x and z is:

434 . The average runs of a cricket player of 10 innings was 32. How many runs must he make in his next innings to increase his average of runs by 4?

435 . The average temperature for the first 4- days of a week is 40.2-degree Celcius and that of the last 4 days is 41.3-degree Celcius If the average temperature for the whole week is 40.6-degree Celcius then the temperature on the fourth day is-

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