16 . A rectangular box, 10inch by 8inch by 4inch is filled with water. If all the water is to be transferrred to cube shaped box,each one 3 inchs on a side,how many of the smaller boxes are needed ?

A. 9
B. 12
C. 16
D. 21
E. None of these

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Answer: Option B

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17 . A rectangular box is 10 inches wide, 10 inches long and 5 inches high. what is the greatest possible distance, in inches ,between any two points on the box?

A. 15
B. 20
C. 25
D. 10

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Answer: Option A

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18 . A rectangular carpet, that is 9 feet by 12 feet, covers 60% of a rectangular floor. What is the area of the floor?

A. 300 square feet
B. 180 square feet
C. 108 square feet
D. 64.8 square feet

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Answer: Option B

Explanation:

Area of the carpet = 9 x 12 = 108 sq ft

60% of the floor = 108 sq ft

So, total or 100% floor area = 108 x 100 / 60 = 180 sq ft

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19 . A rectangular field of 200m by 120m has two roads running along its center, one along the length and the other along the width. If the width of the roads is 5m, what is the area covered by the two roads?

A. 1575 sq.m.
B. 1600 sq.m.
C. 1550 sq.m.
D. 400 sq.m.
E. None of these

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Answer: Option A

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20 . A rectangular tank 10 inch by 8 inch by 4 inch is filled with water. If all of the water is to be transferred to cube-shaped tanks, each one 3 inches on a side, how many of these smaller tanks are needed?

A. 9
B. 12
C. 16
D. 21

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Answer: Option B

Explanation:

Volume of the rectangular tank = 10×8×4 = 320 in3

Volume of a smaller tank = 33 = 27 in3

Number of smaller tanks needed = 320/27 ≈ 12

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Jamuna Bank Ltd - Probationary Officer - 2009

A. 88 meter
B. 84 meter
C. 81 meter
D. 108 meter

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Answer: Option A

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22 . Find the smallest number by which 5808 should be multiplied so that the product becomes a perfect square .

A. 3
B. 7
C. 11
D. 2

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Answer: Option A

Explanation:

5808 = ( 4 × 4) ( 11 × 11) × 3 = 42 × 112 × 3

We need another 3 to make it a full square.

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Bangladesh Bank - Officer(Cash) - 2016

A. 34
B. 40
C. 68
D. 88

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Answer: Option D

Explanation:

Fencing required

=34+34+20

=88 feet

(ans)

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24 . How many square centimeters of construction paper Jesmin needs in order to exactly cover, with no overlap, 5 sides of a cube with edges that are 12 centimeters long?

A. 60
B. 144
C. 300
D. 720

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Answer: Option D

Explanation:

Length of side =a=12cm

Area of one face of cube =a²=122 =144cm²

⇒ Area of 5 faces of cube = 5a² = 5×144 = 720cm²

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25 . How many tiles each 1 foot square are necessary to form a 1 foot border around the inside of a room 24 feet by 14 feet?

A. 36
B. 37
C. 72
D. 74

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Answer: Option C

Explanation:

We have to form a border around the room of 24 * 14.

Also, since room is 24 feet wide in length, we can place 24 tiles on both the sides.

that makes it 48.

we are left with width which is 14 feet.

But out of that we have already placed tiles in 2 feet on both the side while filling up the place for length.

So what we are left with is = 14 + 14 - 2 - 2 = 24

and 24 + 48 = 72

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26 . How many tiles each of 1 square foot are necessary to form a 1 foot border around the inside of a 24 feet by 14 feet room?

A. 36
B. 37
C. 72
D. 74
E. None of these

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Answer: Option C

Explanation:

Area of the total room = 24 x 14 = 336 sq ft

Measurements of the room without the border will be (24 - 1x2) = 22 ft by (14 - 1x2) = 12 ft.

Therefore, Area of the room without the border = 22 x 12 = 264 sq ft

So, the area of the border = 336 - 264 = 72 sq ft.

Then, the number of tiles required = 72/1 = 72.

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27 . How much fence ( in meter ) will be needed to enclose a rectangular field that is 600 cm long and 300 cm wide ?

A. 72
B. 144
C. 240
D. None of these

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Answer: Option D

Explanation:

Wide = 300 cm = 300/100 = 3 meter
Length = 600/100 cm = 6 meter
So, preimeter = 2(wide + length) = 2(3 + 6) = 18 m
So,18 meters will be needed to enclose a rectangular field .

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Bangladesh Bank - Assistant Director - 2001

A. 1060
B. 1000
C. 1020
D. 1040

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Answer: Option D

Explanation:

Field's Length = 360 cm = 3.6 m
& Width = 160 cm = 1.6 m
Field's Perimeter
= 2 (3.6 + 1.6) = 2 × 5.2 = 10.4 m Total cost for fencing
= 10.4 × 100 = Tk. 1040

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Bangladesh Bank - Assistant Director - 2001

A. 65
B. 108
C. 180
D. 270

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Answer: Option B

Explanation:

Area of rectangular RUG = (base)(height) = (9)(12) = 108

This RUG covers 60% of the FLOOR

In other words, 108 = 60% of the area of the FLOOR

Or we can write: 108 = 0.6(area of FLOOR)

So, 108 /0.6 = area of FLOOR

Evaluate to get: 180 = area of FLOOR

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30 . If the side of a square decreases by 30%, then the area of the square decreases by :

A. 14%
B. 21%
C. 49%
D. 51%

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Answer: Option D

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16 . A rectangular box, 10inch by 8inch by 4inch is filled with water. If all the water is to be transferrred to cube shaped box,each one 3 inchs on a side,how many of the smaller boxes are needed ?

17 . A rectangular box is 10 inches wide, 10 inches long and 5 inches high. what is the greatest possible distance, in inches ,between any two points on the box?

18 . A rectangular carpet, that is 9 feet by 12 feet, covers 60% of a rectangular floor. What is the area of the floor?

19 . A rectangular field of 200m by 120m has two roads running along its center, one along the length and the other along the width. If the width of the roads is 5m, what is the area covered by the two roads?

20 . A rectangular tank 10 inch by 8 inch by 4 inch is filled with water. If all of the water is to be transferred to cube-shaped tanks, each one 3 inches on a side, how many of these smaller tanks are needed?

21 . Area of a square field is 484 square meter, find its perimeter.

22 . Find the smallest number by which 5808 should be multiplied so that the product becomes a perfect square .

23 . Hashem wants to put up fencing around three sides of his rectangular yard and leave a side of 20 feet unfenced. If the yard has an area of 680 square feet, how many feet of fencing does he need?

24 . How many square centimeters of construction paper Jesmin needs in order to exactly cover, with no overlap, 5 sides of a cube with edges that are 12 centimeters long?

25 . How many tiles each 1 foot square are necessary to form a 1 foot border around the inside of a room 24 feet by 14 feet?

26 . How many tiles each of 1 square foot are necessary to form a 1 foot border around the inside of a 24 feet by 14 feet room?

27 . How much fence ( in meter ) will be needed to enclose a rectangular field that is 600 cm long and 300 cm wide ?

28 . How much will it cost to fence in a field that is 360 vm long and 160 cm wide with fence costs Tk.100 a meter?

29 . If 60% of a rectangular floor is covered by a rectangular rug of 9 feet by 12 feet, what is the area in square feet of the floor?

30 . If the side of a square decreases by 30%, then the area of the square decreases by :

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