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- Question
- Of the square fields the area of the one is 1 hectare, while the another one is broader by 1% the difference is area is?
Options- A. 101 sq. metres
- B. 201 sq. metres
- C. 100 sq. metres
- D. 200 sq. metres
- Correct Answer
- 201 sq. metres
ExplanationArea of the square field = 1 hectare
= 10000 m2
Side of the square = ? 10000 m = 100 m
Side of another square field = 100 + 1 = 101 m
? Required difference of area
= [(101)2 - (100)2] m2
=[(101 + 100 ) (101 - 100) ] m2
= 201 m2 - 1. A hall 20 m long and 15 m broad is surrounded by a verandah of uniform width of 2.5 m. the cost of flooring the verandah at the rate of 3.50 per sq. meter is?
Options- A. Rs. 500
- B. Rs. 600
- C. Rs. 700
- D. Rs. 800 Discuss
- 2. The length and breadth of a square are increased by 40% and 30% respectively. The area of a resulting rectangle exceeds the area of the square by?
Options- A. 42%
- B. 62%
- C. 82%
- D. None of these Discuss
- 3. The length of a rectangle room is 4 meters . if it can be partitioned into two equal square rooms . what is the length of each partition in meters?
Options- A. 1
- B. 2
- C. 4
- D. Data inadequate Discuss
- 4. A rectangle has 15 cm as its length and 150 cm 2 as its area .Its area is increased to 1 1 / 3 times the original area by increasing only its length . Its new perimeter is?
Options- A. 50 cm
- B. 60 cm
- C. 70 cm
- D. 80 cm Discuss
- 5. Area of a four wall of a room is 77 square meters . the length and breadth of room are 7.5 meters and 3.5 meters respectively . the height of the room is?
Options- A. 3.5 meters
- B. 5.4 meters
- C. 6.77 meters
- D. 7.7 meters Discuss
- 6. If the ratio of the area of two square is 9 : 1 the ratio of their perimeters is?
Options- A. 9:1
- B. 3:1
- C. 3:4
- D. 1:3 Discuss
- 7. The length of a rectangular field is increased by 60 % . By what percent would the width have to be decreased to maintain the same area?
Options- A. 371/2%
- B. 60%
- C. 75%
- D. 120% Discuss
- 8. The area of a rectangle is thrice that of square. Length of the rectangle is 40 cm and the breadth of the rectangle is ( 3 / 2 ) times that of the side of the square. The side of the square in cm is?
Options- A. 15
- B. 20
- C. 30
- D. 60 Discuss
- 9. If the radius of a circle be reduced by 50%. Its area is reduced by?
Options- A. 31.5%
- B. 39.5%
- C. 34.5%
- D. 65.5% Discuss
- 10. The radius of a circle has been reduced from 9 cm to 7 cm . the appropriate percentage decrease in area is?
Options- A. 31.5 %
- B. 39.5 %
- C. 34.5 %
- D. 65.5 % Discuss
Area problems
Search Results
Correct Answer: Rs. 700
Explanation:
Area of verandah = [(25 x 20) -(20 x 15)] m2
= 200 m2
? Cost of flooring = Rs. (200 x 3.50)
= Rs. 700
Correct Answer: 82%
Explanation:
Let the side of the square = 100 m
So area of square = 100 x 100 = 10000.
New length = 140 m,
New breadth = 130 m
Increase in area = [(140 x 130) - (100 x 100)] m2
= 8200 m2
? Required increase percent = (8200/ 10000) x 100 % = 82%
Correct Answer: 2
Explanation:
Let the width of the room be x members
Then, its area = (4x) m2
Area of each new square room = (2x)m2
Let the side of each new room = y meters
Then, y2 = 2x
Clearly, 2x is a complete square when x=2
? y2 = 4
? y = 2 m .
Correct Answer: 60 cm
Explanation:
Breadth of the rectangle = (150/15) cm
= 10 cm
New area = (4/3 x 150) cm2
= 200 cm2
New length = 200/10 cm
=20 cm
New perimeters = 2(20 + 10) cm
= 60 cm
Correct Answer: 3.5 meters
Explanation:
Area of four walls = 2 x (l + b ) x h
? 2 x (7.5 + 3.5 ) x h = 77 m2
? h = 77 / (2 x 11) = 7/2
? h = 3.5 meters
Correct Answer: 3:1
Explanation:
Let the area of square be (9x)2 m2 and (x2) m2
Then, their sides are (3x) m and x metres respectively
? Ratio of their perimeters = 12x / 4x
=3:1
Correct Answer: 371/2%
Explanation:
Let length = L and breadth = B
Let , New breadth = Z
Then, New length = ( 160 / 100) L.
= 8L / 5
? 8L / 5 x Z = LB
or Z = 5B/8
Decrease in breadth = (B-5B/8)
= 3B/8
? Decrease in percent = (3B/8 x1/B ) x 100 %
= 371/2%
Correct Answer: 20
Explanation:
Let the side of the square = y cm
Then, breadth of the rectangle = 3y/2 cm
? Area of rectangle = (40 x 3y/2) cm2
= 60y cm2
? 60y = 3y2
? y = 20
Hence, the side of the square = 20 cm
Correct Answer: 34.5%
Explanation:
Original area = ? x (r/2)2 = ?r2/4
Reduction in area = ? r2 - 3? r2/4
? Reduction per cent = [ 3?r2/4 x 4/(?r2) x 100 ] %
= 75%
Correct Answer: 39.5 %
Explanation:
Original area = (22/7) x 9 x 9 cm2
New area = (22/7) x 7 x 7 cm2
? Decrease = 22/7 x [(9)2 -(7)2] cm2
=(22/7) x 16 x 2 cm2
Decrease percent = [(22/7 x 16 x 2) /( 7/22 x 9 x 9)] x 100 %
= 39.5 %
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