1936 . If the following number pattern continues, what numbers will come next? 50, 30, 40, 20, 30 -----

A. 10, 20
B. 20, 0
C. 30, 50
D. 40, 20
E. None of these

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Answer: Option A

Explanation:

According to the pattern,

50 - 20 = 30

30 + 10 = 40

40 - 20 = 20

20 + 10 = 30

30 - 20 = 10

10 + 10 = 20

1937 . If the following series continues to follow the same pattern, what will be the next number : 2, 6, 3, 9, 6, ......?

A. 3
B. 6
C. 18
D. 14
E. None of them

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Answer: Option C

Explanation:

in each pair, 2nd number is three times of 1st number,

so blank number = 6×3 = 18

1938 . If the hypotenuse of an isosceles right triangle has length of 8 , then the area of the triangle is

A. 4
B. 4√2
C. 16
D. 8√2

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Answer: Option C

Explanation:

1939 . If the income of A is 10% more than that of B and the income of B is 20% less than that of C, then the income of A, B and C respectively are in the ratio

A. 22 : 18 : 25
B. 22 : 20 : 25
C. 10 : 9 : 7
D. 11 : 10 : 8

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Answer: Option B

Explanation:

ধরি, C এর ইনকাম 100 টাকা

B এর ইনকাম ( 100 - 100 এর 20%) = 80 টাকা

A এর ইনকাম ( 80 + 80 এর 10 %) = 88 টাকা।

A : B : C = 88 : 80 : 100 = 22 : 20 : 25

1940 . If the interest on Tk.1200 be more than the interest on Tk.1000 by Tk.50 in 3 years, the rate percent is--

A. 25/3%
B. 29/3%
C. 31/3%
D. 20/3%

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Answer: Option A

Explanation:

1941 . If the langth of a rectangle is increased by 20% and width is decreased by 20% what is the change in area of rectangle ?

A. unchanged
B. increases by 4%
C. increases by 5%
D. decreased by 4%

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Answer: Option D

Explanation:

Let's assume the length of the rectangle is L and the width is W.

Then the original area of the rectangle = L x W

After the increase in length by 20%, the new length = L + 0.2L = 1.2L
After the decrease in width by 20%, the new width = W - 0.2W = 0.8W

So, the new area of the rectangle = (1.2L) x (0.8W) = 0.96LW

Therefore, the new area of the rectangle is 96% of the original area.

Answer: 96% of the original area.

decreased by 4%

Bangladesh bank - officer ( general) - 27.04.2018

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

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Answer: Option C

Explanation:

Here, hypotenuse = √(3² + 4²⁾ = √(9 + 16) = √25 = 5 [using pythagorean theorem]

1943 . If the legs of a right triangle is 3 and 4, then the length of hypotenuse is approximately:

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

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Answer: Option C

Explanation:

1944 . If the length and width of a ractangular garden plot were each increased by 20 percent, what would be the percent increase in the area of the plot?

A. 44%
B. 24%
C. 36%
D. 40%

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Answer: Option A

Explanation:

Short - cut Formula :

A + B + AB/100

20 + 20 ( 20× 20) / 100 = 44

1945 . If the length and width of a rectangular garden plot were each increased by 20 percent, what would be the percent increase in the area of the plot?

A. 44%
B. 24%
C. 36%
D. 40%
E. none of them

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Answer: Option A

Explanation:

Short - cut Formula :

A + B + AB/100

20 + 20 ( 20× 20) / 100 = 44

1946 . If the length and width of a rectangular garden plot were each increased by 20 percent. What would be the percent increase in the area of the plot ?

A. 44%
B. 24%
C. 36%
D. 40%
E. None of these

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Answer: Option A

Explanation:

Short - cut Formula :

A + B + AB/100

20 + 20 ( 20× 20) / 100 = 44

Bangladesh Bank - Assistant Director - 2009

A. decreased by 20%
B. decreased by 4%
C. stays the same
D. increases by 10%

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Answer: Option B

Explanation:

We can let L = the original length

and W = the original width

Thus, the original area of the rectangular is LW and the new area is 1.2L× 0.8W = 0.96LW

So, the area is decreased by 4%

1948 . If the length of a rectangle is increased by 20% and width is decreased by 20% ,what is the change in area of the rectangle?

A. unchanged
B. decreases by 4%
C. increases by 4%
D. increases by 5%

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Answer: Option B

Explanation:

অফিসার (সাধারণ) ২৭.১২. ২০১৯

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%]

1950 . 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

1936 . If the following number pattern continues, what numbers will come next? 50, 30, 40, 20, 30 -----

1937 . If the following series continues to follow the same pattern, what will be the next number : 2, 6, 3, 9, 6, ......?

1938 . If the hypotenuse of an isosceles right triangle has length of 8 , then the area of the triangle is

1939 . If the income of A is 10% more than that of B and the income of B is 20% less than that of C, then the income of A, B and C respectively are in the ratio

1940 . If the interest on Tk.1200 be more than the interest on Tk.1000 by Tk.50 in 3 years, the rate percent is--

1941 . If the langth of a rectangle is increased by 20% and width is decreased by 20% what is the change in area of rectangle ?

1942 . If the legs of a right triangle is 3 and 4, then the length of hypotenuse is approximately :

1943 . If the legs of a right triangle is 3 and 4, then the length of hypotenuse is approximately:

1944 . If the length and width of a ractangular garden plot were each increased by 20 percent, what would be the percent increase in the area of the plot?

1945 . If the length and width of a rectangular garden plot were each increased by 20 percent, what would be the percent increase in the area of the plot?

1946 . If the length and width of a rectangular garden plot were each increased by 20 percent. What would be the percent increase in the area of the plot ?

1947 . If the length of a rectangle is increased by 20% and the width is decreased by 20%, then the area is :

1948 . If the length of a rectangle is increased by 20% and width is decreased by 20% ,what is the change in area of the rectangle?

1949 . 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?

1950 . 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):

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