391 . 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?

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

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392 . 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.

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Bangladesh Bank - Assistant Director - 2011

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

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Answer: Option D

Explanation:

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394 . 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.

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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

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396 . 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.

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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

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398 . 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:

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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:

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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

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

A. 57
B. 59
C. 53
D. 55
E. None

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Answer: Option A

Explanation:

The total weight of them = 53×3 = 159 kg

Minimum weight possible for any 2 of them = 51×2 = 102 kg

Maximum weight of any 1 of them = 159 - 102 = 57 kg

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402 . The compound interest on Tk.10000 for 4 years @ 5% per annum will be approximately

A. Tk.2000
B. Tk.2025
C. Tk.2075
D. Tk.2100
E. Tk.2155

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Answer: Option E

Explanation:

I=p(1+r)^n

=10000(1+5/100)⁴

=12155.06

So, Compound Interest=12155.06-10000=2155.06≈2155

(ans)

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Bangladesh Bank - Assistant Director - 2006

A. 3
B. 4
C. 6
D. 8
E. None of these

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Answer: Option E

Explanation:

The objective here is that 70% of the fruit in the box should be apples.

Now, there are 6 apples at start and there is no talk of removing any apples, so number of apples should remain 6 and they should constitute 70% of total fruit, so total fruit = 6/0.7 = 12 [approximate]
So we should have 12-6 = 6 oranges.
Right now, there are 27 oranges, so to get to 6 oranges, we should remove 27 - 6 = 21 oranges.

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404 . The difference between a number and its square is 72. What is the number?

A. 18
B. 19
C. 30
D. 9

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Answer: Option D

Explanation:

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

A. 75
B. 1000
C. 125
D. None of these

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Answer: Option C

Explanation:

Let the no be x

Acc to ques.

x-3x/5 = 50

So,x=125

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391 . 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?

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392 . 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 ?

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

394 . 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 __

395 . 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?

396 . 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?

397 . 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:

398 . 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:

399 . 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?

400 . 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-

401 . The average weight of 3 men is 53 kg. None of them weights less than 51 kg. What is the maximum possible weight (in kg) of a person in that group?

402 . The compound interest on Tk.10000 for 4 years @ 5% per annum will be approximately

403 . The contents of a certain box consist of 9 apples and 27 oranges. How many oranges must be removed from the box so that 70% of the pieces of fruits in the box will be apples?

404 . The difference between a number and its square is 72. What is the number?

405 . The difference between a number and its three-fifth is 50. What is the number?

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