1471 . Average age of three brothers is 16 years . Average age of these brothers along with their father is 25 years. What is the age of their father ?

A. 42
B. 52
C. 41
D. 45

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Answer: Option B

Explanation:

Total age of the three brothers = 3 x 16 = 48 years

Total age of the brothers along with their father = 4 x 25 = 100

So, age of the father = 100 - 48 = 52 years

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1472 . Average mark in Math in a class of 40 students is 45. Average mark of all the 30 boys is 50. Then the average mark obtained by the girls is :

A. 30
B. 35
C. 25
D. 40

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Answer: Option A

Explanation:

No. of students = 40

No. of Boys = 30

No. of Girls = 10

Average of 40 stuents = 45

Total of students = 45 *40 = 1800

Aerage of 30 students = 50

Total of 30 = 30 * 50 = 1500

Total of 10 girls = 1800 - 1500 = 300

Average mark of 10 girls = 300/10 = 30

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Bangladesh Bank - Assistant Director - 2010

A. 4
B. 6
C. 8
D. 10

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Answer: Option A

Explanation:

here,let, the consecutive even numbers are = n,n + 2,n + 4,n + 6,n + 8

here, (n + n + 2 + n + 4 + n + 6 + n + 8)/5 = 8

or,5n + 20 = 40

or,5n = 20

or,n = 4

so, the smallest of the numbers is 4

ans: 4

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1474 . Average of P numbers is x and average of N numbers is y. Find the average of all of the numbers.

A. (Px + Ny)/(p + N)
B. (Px + Ny)/xy(P + N)
C. x + y
D. (x + y)/(P + N)

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Answer: Option A

Explanation:

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1475 . Average of ten positive numbers is x. If each number increases by 10%, then x-

A. remains unchanged
B. may increase or decrease
C. will increase
D. is increased by 10%

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Answer: Option D

Explanation:

Let 10 numbers be x1, x2, x3, . . . . . . . x10
According to question average of these 10 numbers is 10
$$ \Rightarrow \frac{{ {x1 + x2 + x3 + .... + x10} }}{{10}} = x$$
Now if each number is increased by 10%,
then new average, say y.
$$y = \frac{{ {1.1x1 + 1.1x2 + 1.1x3 + .... + 1.1x10} }}{{10}}$$
$${\kern 1pt} \Rightarrow y = 1.1 \times {\frac{{ {x1 + x2 + x3 + .... + x10} }}{{10}}} $$
$$\eqalign{ & \Rightarrow y = 1.1x \cr & \Rightarrow y\,{\text{is }}10\% \,{\text{increased}} \cr} $$.

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সমন্বিত ১০ ব্যাংক ও আর্থিক প্রতিষ্ঠান || অফিসার (জেনারেল) (08-03-2024)

A. 4
B. 3
C. 5
D. 6

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Answer: Option A

Explanation:

পাঁচটি constant even number ধরি, n, n + 2, n + 4, n + 6, n + 8

যোগফলকে 5 দিয়ে ভাগ করলে average পাওয়া যায় n + 4

তাহলে, n + 4 = 8 বা n = 4

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1477 . Average of the five consecutive even numbers is 8. Which is the smallest of the 5 numbers?

A. 4
B. 3
C. 5
D. 6
E. None of them

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Answer: Option A

Explanation:

here,let, the consecutive even numbers are = n,n + 2,n + 4,n + 6,n + 8

here, (n + n + 2 + n + 4 + n + 6 + n + 8)/5 = 8

or,5n + 20 = 40

or,5n = 20

or,n = 4

so, the smallest of the numbers is 4

ans: 4

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Sonali- Janata- Agrani &amp- Rupali Bank Ltd. Senior Officer Recruitment 14.03.2008

A. 126
B. 122
C. 118
D. 120

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Answer: Option A

Explanation:

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1479 . B = 3 : 4 এবং B : C = 6 : 5 হলে, A : C = কত?

A. 3 : 5
B. 9 : 10
C. 10 : 9
D. 4 : 9

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Answer: Option B

Explanation:

A:B=3:4=3*3:4*3=9:12

B:C=6:5=6*2:5*2=12:10

A:B:C=9:12:10

A:C=9:10(ans)

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1480 . Babu's income is Tk.1000 more than that of Selim. Their total salary is Tk.x. What is Selim's salary?

A. x/2 - 500
B. (x + 1000)/2
C. (2x - 500)/2
D. 2x - 1000

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Answer: Option A

Explanation:

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1481 . Babul attended five tests during the semester and the average of his test scores was 87. If has average score after first three tests were 85, what was the average of his 4th and 5th test?

A. 88
B. 89
C. 90
D. 93
E. None of these

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Answer: Option C

Explanation:

Total of five test scores = 5 x 87 = 435

Total of first three test scores = 3 x 85 = 255

Total of last two test scores = 435 - 255 = 180

Therefore, averaage of 4th & 5th test scores = 180/2 = 90.

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1482 . Baki lives 2 miles west of Raju's house. Rafiq lives 3 mniles north of Raju's house and 2 miles west of Diba's house. What is the straight-line distance from Bakis's house to Diba's house?

A. 5 miles
B. 6 miles
C. 7 miles
D. 10 miles
E. None of these

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Answer: Option A

Explanation:

From pithagorous theorem,

Distance = root (4)² + (3)² = 5 miles

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1483 . Bangladeshi supporters in a stadium double every match. In the eighth match, there were 48000 supporters which was the full capacity of the stadium. In which match did the Bangladeshi supporter fill up half the capacity of the stadium?

A. 2nd match
B. 4th match
C. 6th match
D. 7th match

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Answer: Option D

Explanation:

প্রতিদিন সমর্থক দ্বিগুন হয়।তাই ৮ম দিনে ৪৮০০০ জন থাকলে সপ্তম দিনে সমর্থক ছিল ২৪০০০ জন যা স্টেডিয়ামের ধারণ ক্ষমতার অর্ধেক।

অতএব, সপ্তম দিনে স্টেডিয়ামের ধারণ ক্ষমতার অর্ধেক ছিল।

উত্তর : ৭ম ম্যাচ

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Sonali &amp- Janata Bank Ltd. Senior Officer (IT/ICT) 08.06.2018

A. 25
B. 34
C. 40
D. 46
E. None of these

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Answer: Option C

Explanation:

***The question is erroneous.

Let the number of each type stamps is S.

Now, 10 TK = 10 x 100 paisa = 1000 paisa

So, 20S + 30S = 1000

or, 50S = 1000

or, S = 100/50 = 20

So, the number of total stamps = 20 + 20 = 40

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1485 . Barkat/Murad bought equal numbers of 20-paisa and 30-paisa stamps. If the total cost of the stamps was Tk.10.00, what was the total number of stamps bought?

A. 25
B. 34
C. 40
D. 46

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Answer: Option C

Explanation:

Let, x is the number of 20 - poisa stamps.

Then the number of 30 - poisa stamps is x too.

Note that 10 taka = 1000 poisa.

Therefore, we obtain the following equation -

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1471 . Average age of three brothers is 16 years . Average age of these brothers along with their father is 25 years. What is the age of their father ?

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1472 . Average mark in Math in a class of 40 students is 45. Average mark of all the 30 boys is 50. Then the average mark obtained by the girls is :

1473 . Average of 5 consecutive even numbers is 8, Which is the smallest of the 5 number

1474 . Average of P numbers is x and average of N numbers is y. Find the average of all of the numbers.

1475 . Average of ten positive numbers is x. If each number increases by 10%, then x-

1476 . Average of the five consecutive even number is 8. Which is the smallest of the 5 numbers?

1477 . Average of the five consecutive even numbers is 8. Which is the smallest of the 5 numbers?

1478 . Average weight of 8 persons is 120 lb. One person leaves the group and a new person comes in and the new average is 122 lb. If the weight of the outgoing person is 110 lb, then what is the weight of the incoming person?

1479 . B = 3 : 4 এবং B : C = 6 : 5 হলে, A : C = কত?

1480 . Babu's income is Tk.1000 more than that of Selim. Their total salary is Tk.x. What is Selim's salary?

1481 . Babul attended five tests during the semester and the average of his test scores was 87. If has average score after first three tests were 85, what was the average of his 4th and 5th test?

1482 . Baki lives 2 miles west of Raju's house. Rafiq lives 3 mniles north of Raju's house and 2 miles west of Diba's house. What is the straight-line distance from Bakis's house to Diba's house?

1483 . Bangladeshi supporters in a stadium double every match. In the eighth match, there were 48000 supporters which was the full capacity of the stadium. In which match did the Bangladeshi supporter fill up half the capacity of the stadium?

1484 . Barkat bought equal numbers of 2-paisa and 30-paisa stamps. If the total cost of the stamps was Tk. 10.00, what was the total number of stamps bought?

1485 . Barkat/Murad bought equal numbers of 20-paisa and 30-paisa stamps. If the total cost of the stamps was Tk.10.00, what was the total number of stamps bought?

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