2716 . The average of four consecutive odd positive integers is always--

A. an even number
B. an odd number
C. divisible by 4
D. Both a and c

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Answer: Option A

Explanation:

1 + 3 + 5 + 7 = 16

average = 16/4 = 4

even number

2717 . 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:

৯টি সংখ্যার সমষ্টি= ৯×৫০=৪৫০

প্রথম ৫টি সংখ্যার সমষ্টি=৫×৫৪=২৭০

শেষের ৩টি সংখ্যার সমষ্টি=৩×৫২=১৫৬

অতএব, প্রথম ৫টি ও শেষের ৩টি সংখ্যার সমষ্টি= ২৭০+১৫৬=৪২৬

অতএব, ষষ্ঠ সংখ্যাটি =৪৫০-৪২৬=২৪

2718 . The average of runs of a cricket player of 10 innings was 32. How many runs must he make in his next inning so as to increase his average of runs by 4?

A. 2
B. 4
C. 70
D. 76

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Answer: Option D

Explanation:

Average= Total runs/ No. of innings =32
So,
Total runs
=32×10
=320
Now increase in average is 4 runs
so,
New average =32+4=36 runs
Total runs =36×11=396
Runs made in the 11th inning =396−320=76

2719 . 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

2720 . 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

2722 . 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

2723 . The average of the two-digit numbers, which remain the same when the digits interchange their positions , is :

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

2725 . 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:

2726 . 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

2727 . 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 -

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

2729 . 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:

2716 . The average of four consecutive odd positive integers is always--

2717 . 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:

2718 . The average of runs of a cricket player of 10 innings was 32. How many runs must he make in his next inning so as to increase his average of runs by 4?

2719 . 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?

2720 . The average of six numbers is 14. The average of four of these numbers is 15. The average of the remaining two number is -

2721 . 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?

2722 . The average of six numbers is x and the average of three is y. If the average of the remaining three is z, then :

2723 . The average of the two-digit numbers, which remain the same when the digits interchange their positions , is :

2724 . The average of three numbers is 7. If 2 of the numbers are zero, then what if the 3rd number?

2725 . The average of three numbers is V. If one of the numbers is Z and another is Y, then what is the remaining number?

2726 . The average of two numbers is 6.5 and square root of their product is 6 . What are the number?

2727 . 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 -

2728 . The average of x and another number is z. the other number must be ----

2729 . 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 -

2730 . 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?

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