3031 . The average of the first natural numbers is: Created:

A. 12.5
B. 28
C. 25.5
D. None of these

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Answer: Option D

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One Bank Ltd || Special Cadre Officer (03-01-2025) || 2025

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3032 . The average of the first nine -prime numbers is:

A. $9$
B. $11$
C. $11 \frac{1}{9}$
D. $11 \frac{2}{9}$

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Answer: Option C

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Bangladesh Bank - Assistant Director - 2014

A. 33
B. 44
C. 55
D. 66

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Answer: Option C

Explanation:

= 11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 999 = (11 + 99) + (22 + 88) + (33 + 77) + (44 + 66) + 559 = 4 × 110 + 559 = 4959 = 55.

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Bangladesh Bank - Assistant Director - 2014

A. 15
B. 17
C. 19
D. 21

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Answer: Option D

Explanation:

given, average of 3 numbers is 7

and 2 of the numbers are zero

let the 3rd number is x

According to the question,

(x + 0 + 0)/3 = 7

or, x = 21

ans: 21

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3035 . The average of three numbers is V. If one of the numbers is Z and another is Y, then what is the remaining number?

A. z/x - z - y
B. 3V - Z - Y
C. V - Z - Y
D. ZY - V

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Answer: Option B

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3036 . The average of two numbers is 6.5 and square root of their product is 6 . What are the number?

A. 11 and 2
B. 8 and 5
C. 10 and 3
D. 9 and 4

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Answer: Option D

Explanation:

{(x + y)/2} = 6.5

= > x + y = 13

আবার, ✓(xy) = 6

= > xy = 36

Option থেকে 9 + 4 = 14 এবং 6×4 = 36

So, Ans. 9 and 4

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3037 . The average of two numbers is 62. If 2 is added to the smaller number, the ratio between the numbers becomes 1 : 2. What is the smaller number?

A. 40
B. 30
C. 60
D. 80

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Answer: Option A

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Bangladesh Bank - Officer - 2015

A. z-x
B. (z+x)/2
C. 2z-x
D. none of these

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Answer: Option C

Explanation:

The average of x and another number is z.

Sum of x and the other number is = 2z

so, the other number must be = 2z - x

ans: 2z - x

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3039 . The average temperature for the first 4-days of a week is 40,2º C and that of the last 4-days is 41.3°C. If the average temperature for the whole week is 40.6° C, then temperature on the fourth day is -

A. 38.5 ° C
B. 41.8° C
C. 41.3°C
D. 40.8° C

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Answer: Option B

Explanation:

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

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বাংলাদেশ ব্যাংক অফিসার ০২ -১২-২০২২

A. 24°c
B. 21°c
C. 27°c
D. 30°c

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Answer: Option D

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3041 . The average wage of a worker during a fortnihgt comprising 15 consecutive working days was Taka 90 per day. During the first 7 days, his average wage was Taka 87 per day and the average wage during the last 7 days was Taka 92 per day. What was his wage on the 8th day ?

A. 83
B. 90
C. 92
D. 97

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Answer: Option D

Explanation:

15 দিনের কাজের মোট বেতন ( 15 × 90) = 1350 টাকা

১ম 7 দিন ও শেষ 7 দিনের কাজের মোট বেতন ( 7 × 87 + 7 × 92) = 609 + 644 = 1253 টাকা।

অষ্টম দিনের কাজের বেতন ( 1350 - 1253) টাকা = 97 টাকা

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3042 . The average weight for a group of 20 women is 130 pounds. If the average weight for 75% of these women was 140 pounds, what was the average weight in pounds for the rest of the women?

A. 100
B. 110
C. 120
D. 135

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Answer: Option A

Explanation:

Total weight of 20 women = 20 x 130 = 2600 pounds

Total weight of 75% of 20 = 15 women = 15 x 140 = 2100 pounds

Total weight of the rest 5 women = 2600 - 2100 = 500 pounds

Then, the average weight of these 5 women = 500/5 = 100 pounds.

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সমন্বিত ১০ ব্যাংক ও আর্থিক প্রতিষ্ঠান || সিনিয়র অফিসার (10-11-2023)

A. 37
B. 35
C. 33
D. 32

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Answer: Option A

Explanation:

Total Weight = (33*3) kg = 99 kg

Let,

Two friends minimum weight = 31 kg and 31kg

So, third friend Maximum weight = (99 - 31 - 31)kg = 37 kg .

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Bangladesh Bank - Officer - 2001

A. 60
B. 70
C. 75
D. 80

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Answer: Option D

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3045 . The average weight of 8 people increases by 2.5 kg when a new person comes in place of one of them weighting 65 kg. What might be the weight of the new person?

A. 85 kg
B. 80 kg
C. 75 kg
D. Cannot be determined
E. None of these

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Answer: Option A

Explanation:

Let the average of 8 people be x kg

And the weight of the new person be y kg

Sum of 8 people weight is

⇒ 8 × x = 8x kg

When the person is replaced.

⇒ 8x + y - 65 = 8 × (x + 2.5)

⇒ 8x + y - 65 = 8x + 20

⇒ y = 65 + 20 = 85 kg

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3031 . The average of the first natural numbers is: Created:

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3033 . The average of the two-digit numbers, which remain the same when the digits interchange their positions , is :

3034 . The average of three numbers is 7. If 2 of the numbers are zero, then what if the 3rd number?

3035 . The average of three numbers is V. If one of the numbers is Z and another is Y, then what is the remaining number?

3036 . The average of two numbers is 6.5 and square root of their product is 6 . What are the number?

3037 . The average of two numbers is 62. If 2 is added to the smaller number, the ratio between the numbers becomes 1 : 2. What is the smaller number?

3038 . The average of x and another number is z. the other number must be ----

3039 . The average temperature for the first 4-days of a week is 40,2º C and that of the last 4-days is 41.3°C. If the average temperature for the whole week is 40.6° C, then temperature on the fourth day is -

3040 . The average temperature on Wednesday,Thursday and Friday was 25°c. The average temperature on Thursday, Friday and Saturday was 24°c. If the temperature on saterday was 27°c, what was the temperature on Wednesday?

3041 . The average wage of a worker during a fortnihgt comprising 15 consecutive working days was Taka 90 per day. During the first 7 days, his average wage was Taka 87 per day and the average wage during the last 7 days was Taka 92 per day. What was his wage on the 8th day ?

3042 . The average weight for a group of 20 women is 130 pounds. If the average weight for 75% of these women was 140 pounds, what was the average weight in pounds for the rest of the women?

3043 . The average weight of 3 friends is 33 kg. None of the friends weights less than 31 kg . What can be the maximum weight of any three friends ?

3044 . The average weight of 6 persons of a group is 75 kg.If a person weighting 50 kg leaves the group, what will be the average weight of the group m?

3045 . The average weight of 8 people increases by 2.5 kg when a new person comes in place of one of them weighting 65 kg. What might be the weight of the new person?

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