2161 . If the length of a rectangle is increased by 40% and the width is decreased by 20%, the area of the rectangle will increase by?

A. 20%
B. 12%
C. 8%
D. none of these

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Answer: Option B

Explanation:

Let the initial length and width be L & W respectively.

Then, initial area = L x W

Length after 40% increament = 1.4L

Width after 20% decreament = 0.8W

New area = 1.4L x 0.8W = 1.12 (L x W)

So, area will increase by 12%.

[Shortcut: ( + 40) + ( - 20) + ( + 40)x( - 20)/100 = + 12%]

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2162 . If the length of a rectangular field is 30 feet more than its width and the perimeter is 380 feet, the area of the field is (in sq. feet):

A. 11400
B. 8800
C. 11800
D. 9400

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Answer: Option B

Explanation:

Let, the width = x feet

the length = x + 30 feet

We know, perimeter = 2(Length + breadth)

Perimeter = 2(x + 30 + x)

According to the question

2(x + 30 +x) = 380

=> 4x + 60 = 380

=> 4x = 380 – 60

x = 80 feet.

The length is = 80 + 30 = 110 feet

Area =110 x 80 Sq. feet

= 8,800 Sq. feet

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2163 . If the length of each of the sides of three square plots is increased by 50 percent, how much does the watch gain in one day?

A. 375%
B. 200%
C. 150%
D. 125%

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Answer: Option D

Explanation:

Shortcut method:

a+b+(ab/100)

=50+50+(50×50)/100

=125%

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2164 . If the length of rectangle A is one-half the length of rectangle B, and the width of rectangle A is one-half the width of rectangle B, what is the ratio of the area of rectangle A to the area of rectangle B?

A. 1/4
B. 1/2
C. 1/1
D. 2/1

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Answer: Option A

Explanation:

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2165 . If the length of rectangle B and the width of rectangle A is one-half the width of rectangle B, what is the ratio of the area of rectangle A to the area of rectangle B?

A. 1/4
B. 1/2
C. 1/1
D. 2/1

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Answer: Option D

Explanation:

Let length of rectangle B be L and width be H
So, for rectangle A, length = L/2 and width = H/2

So, area of A/area of B = (L/2*H/2)/L*H = 1/4.

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Bangladesh bank - officer ( general) - 27.04.2018

A. Decreased by 9%
B. Increased by 9%
C. Decreased by 18%
D. Increased by 16%

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Answer: Option A

Explanation:

Short Cut Formula

A + B + AB/100 = 30 - 30 + 30*( - 30)/100 = - 9.

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Bangladesh Bank - Assistant Director - 2010

2167 . If the line AB and CD meet at O and $∠ B O S = 60 °,$ then $∠ B O C = ?$

A. $27 °$
B. $63 °$
C. $117 °$
D. $297 °$

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Answer: Option C

Explanation:

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অফিসার (জেনারেল) - 12.11.2021

A. 125
B. 25
C. 5
D. 250
E. 12.50

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Answer: Option B

Explanation:

SP of 5 units = 25×5 = 125 tk

[SP = Revenue]

Average = 125/5 = 25

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Sonali- Janata &amp- Agrani Bank Offier (Cash Recruitment) 22.02.2008

A. 58
B. 390
C. 78
D. 310

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Answer: Option C

Explanation:

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First Security Islami Bank Ltd | Probationary Officer | 19-02-2021

A. U , W and Z
B. V, X and Z
C. X, y and Z
D. V , W and Z

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Answer: Option D

Explanation:

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2171 . If the nth terms of an arithmetic progression is 4n+1, then the common difference is-

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

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Answer: Option A

Explanation:

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

A. 3
B. 6
C. 7
D. 2

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Answer: Option D

Explanation:

প্রশ্নে উল্লেখিত (*) এর স্থানে একমাত্র 2 বসালেই সংখ্যাটি হবে ( 522) যা দ্বারা বিভাজ্য হয়।

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Bangladesh Bank - Officer(Cash) - 2016

A. 1
B. 2
C. 3
D. 4

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Answer: Option C

Explanation:

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Bangladesh Bank - Assistant Director - 2014

A. 12/17
B. 10/16
C. 12/19
D. 9/11

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Answer: Option C

Explanation:

(x + 150% of x)/(y + 200% of y) = 10/19
2.5x/3y = 10/19
x/y = 10 × 3/19 × 2.5 = 12/19. Ans: C

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Officer (Cash) -Sonali Bank | BD Development | BD Krishi Bank - 12.10.2018

A. 5/9
B. 5/8
C. 7/12
D. 11/12

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Answer: Option B

Explanation:

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Officer (General) -Ansar VDP Unnayan | BD House Building Finance Corporation 28.09.2018

2161 . If the length of a rectangle is increased by 40% and the width is decreased by 20%, the area of the rectangle will increase by?

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2162 . If the length of a rectangular field is 30 feet more than its width and the perimeter is 380 feet, the area of the field is (in sq. feet):

2163 . If the length of each of the sides of three square plots is increased by 50 percent, how much does the watch gain in one day?

2164 . If the length of rectangle A is one-half the length of rectangle B, and the width of rectangle A is one-half the width of rectangle B, what is the ratio of the area of rectangle A to the area of rectangle B?

2165 . If the length of rectangle B and the width of rectangle A is one-half the width of rectangle B, what is the ratio of the area of rectangle A to the area of rectangle B?

2166 . If the length of rectangle is increased by 30% and the width is decreased by 30%, then the area will be

2168 . If the market price is Tk. 25, the average revenue of selling five units in Taka is :

2169 . If the mean of numbers 28, x, 42, 78 and 104 is 62, what is the mean of 48,62,98,124 and x?

2170 . If the members of the Public service Commission are V ,W and Z , and If the Rent control Commission is to have as many members in common with the Public Service Commission as the rules allow , the Rent Control Commission must consist of __

2171 . If the nth terms of an arithmetic progression is 4n+1, then the common difference is-

2172 . If the number 5 * 2 is divisible by 6, then * = ?

2173 . If the number 91876 * 2 is completely divisible by 8, then the smallest whole number in place of will be:

2174 . If the numerator of a fraction is increased by 150% and the denominator of a fraction increased by 200% fraction becomes 10/19. Find the fraction.

2175 . If the numerator of fraction is increased by 200% and the denominator is increased by 350% The resultant fraction is 5/12. What was the original fraction?

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