2851 . 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?

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

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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

প্রিমিয়াম প্ল্যান: ১ মাস

99 ৳

৩০ দিনের জন্য সকল লাইভ এবং আর্কাইভ মডেল টেস্ট, প্রশ্ন ব্যাংক ও লেকচার শিট সহ অ্যাপ এর প্রিমিয়াম সব এক্সেস পাবেন।

সাবস্ক্রিপশন লিংক

2852 . The average of six numbers is 14. The average of four of these numbers is 15. The average of the remaining two number is -

A. 4
B. 8
C. 12
D. 16

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Answer: Option C

Explanation:

T h e s u m o f s i x n u m b e r s = (14 \times 6) = 84 The sum of 4 numbers = (15 \times 4) = 60 ∴ Average remaining two numbers = \frac{84 - 60}{2} = \frac{24}{2} = 12

অফিসার (সাধারণ) ২৭.১২. ২০১৯

A. 4.5
B. 4.6
C. 4.7
D. 4.8

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Answer: Option B

Explanation:

Sum of the reaming two numbers are

= ( 3.95 ×6) - [ (3.4×2) + ( 3.85×2) ]

= 23.70 - ( 6.8 + 7.7)

= 23.70 - 14.5

= 9.20

Average = 9.20/2 = 4.6

2854 . The average of six numbers is x and the average of three is y. If the average of the remaining three is z, then :

A. x=y+z
B. x=2y+2z
C. 2x=y+z
D. none of these

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Answer: Option C

Explanation:

Hints: Average of 6 numbers = x

sum of 6 numbers = 6x

Average of the 3 numbers = y

sum of the 3 numbers = 3y

Average of the remaining 3 numbers = z

sum of the remaining 3 numbers = 3z

Now, we know that 6x = 3y + 3z

2x = y + z

2855 . 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

Explanation:

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

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.

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

2858 . 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

Explanation:

2859 . 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

2860 . 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

Explanation:

জনতা ব্যাংক || অফিসার (আরসি) (28-06-2024) || 2024

A. 30
B. 40
C. 60
D. 84

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Answer: Option B

Explanation:

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

2863 . 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

সমন্বিত ৭ ব্যাংক || অফিসার (ক্যাশ) (24-05-2024)

A. 24°c
B. 21°c
C. 27°c
D. 30°c

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Answer: Option D

Explanation:

2865 . 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

2851 . 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?

2852 . The average of six numbers is 14. The average of four of these numbers is 15. The average of the remaining two number is -

2853 . The average of six numbers is 3.95. The average of two of them is 3.4, while average of the other two is 3.85. What is the average of the remaining two numbers?

2854 . The average of six numbers is x and the average of three is y. If the average of the remaining three is z, then :

2855 . The average of the first natural numbers is: Created:

2856 . The average of the two-digit numbers, which remain the same when the digits interchange their positions , is :

2857 . The average of three numbers is 7. If 2 of the numbers are zero, then what if the 3rd number?

2858 . The average of three numbers is V. If one of the numbers is Z and another is Y, then what is the remaining number?

2859 . The average of two numbers is 6.5 and square root of their product is 6 . What are the number?

2860 . 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?

2861 . The average of two numbers is 62. If 2 is added to the smaller number, the ratio between the numbers becomes 1 :2 . The smaller number is -

2862 . The average of x and another number is z. the other number must be ----

2863 . 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 -

2864 . 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?

2865 . 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 ?

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