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- Question
A towel, when bleached, was found to have lost 20% of its length and 10% of its breadth. The percentage of decrease in area is:
Options- A. 18%
- B. 28%
- C. 38%
- D. 48%
- Correct Answer
- 28%
ExplanationLet original length = x and original breadth = y.
Decrease in area = xy - = (7/25)xy
Decrease % = (7/25)xy * (1/xy) * 100 = 28%
- 1. In ?ABC, AC = BC and ?ABC = 50°, the side BC is produced to D so that BC = CD then the value of ?BAD is
Options- A. 80°
- B. 40°
- C. 90°
- D. 50° Discuss
- 2. The four sides of a quadrilateral are in the ratio of 2:3:4:5 and its perimeter is 280m. The length of the longest side is
Options- A. 100m
- B. 150m
- C. 175m
- D. 180m Discuss
- 3. The area of the largest sphere ( in cm2) that can be drawn inside a square of side 18 cm is
Options- A. 972?
- B. 11664?
- C. 36?
- D. 288? Discuss
- 4. The area of a circle is 616 sq cm, find its circumference?
Options- A. 44 cm
- B. 88 cm
- C. 22 cm
- D. 176 cm Discuss
- 5. D and E are points on side AB and AC of ?ABC. DE is parallel to BC. If AD:DB = 2:3 and area of ?ABC is 100 sq cm, what is the area (in sq cm) of quadrilateral BDEC?
Options- A. 84
- B. 16
- C. 25
- D. 75 Discuss
- 6. A rectangular field is to be fenced on three sides leaving a side of 20 feet uncovered. If the area of the field is 680 sq. feet, how many feet of fencing will be required?
Options- A. 22
- B. 44
- C. 66
- D. 88 Discuss
- 7. Find the length of the altitude of an equilateral triangle of side 33 cm.
Options- A. 4.5
- B. 3.5
- C. 2.5
- D. 6.5 Discuss
- 8. A square and rectangle have equal areas. If their perimeters are p and q respectively. Then
Options- A. p
- B. p>q
- C. p=q
- D. none of these Discuss
- 9. An error of 2% in excess is made while measuring the side of a square. The percentage of error in the calculated area of the square is
Options- A. 4.04%
- B. 5.04%
- C. 6.04%
- D. 7.04% Discuss
- 10. Find the area of the rectangle or square with the given dimensions L = 5 inches, W= 3 inches?
Options- A. 13
- B. 14
- C. 15
- D. 16 Discuss
Area problems
Search Results
Correct Answer: 90°
Correct Answer: 100m
Correct Answer: 972?
Correct Answer: 88 cm
Correct Answer: 84
Correct Answer: 88
Explanation:
We have: l = 20 ft and lb = 680 sq. ft.So, b = 34 ft.
Length of fencing = (l + 2b) = (20 + 68) ft = 88 ft.
Correct Answer: 4.5
Explanation:
Let the length of the altitude be h.
Then, h =
=
= 4.5
Correct Answer: p
Explanation:
square and a rectangle with equal areas will satisfy the
relation p < q
Correct Answer: 4.04%
Explanation:
100 cm is read as 102 cm
a = 100 x 100 sq.cm and b = 102 x 102 sq.cm
then, Increase in area = [ (102 x 102) - (100 x 100) ] sq.cm
percentage error = = 4.04%
Correct Answer: 15
Explanation:
We know that,
Area of rectangle A = L x W = 5 x 3 = 15 sq.inches.
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