Aptitude - Area - Discussion
Discussion Forum : Area - General Questions (Q.No. 3)
3.
The ratio between the perimeter and the breadth of a rectangle is 5 : 1. If the area of the rectangle is 216 sq. cm, what is the length of the rectangle?
Answer: Option
Explanation:
| 2(l + b) | = | 5 |
| b | 1 |
2l + 2b = 5b
3b = 2l
| b = | 2 | l |
| 3 |
Then, Area = 216 cm2
l x b = 216
| l x |
2 | l | = 216 |
| 3 |
l2 = 324
l = 18 cm.
Discussion:
22 comments Page 3 of 3.
Sankar said:
1 decade ago
No its wrong. Value is given in ratio.
P.bharathi said:
1 decade ago
I have done like below :
Perimeter=2(l+b),
5x=2(l+x)=2l+2x => l=3x/2,
Area = 3x/2*x = 216=> I got the value for x is 12 which is the length.
Is it correct ah?
Perimeter=2(l+b),
5x=2(l+x)=2l+2x => l=3x/2,
Area = 3x/2*x = 216=> I got the value for x is 12 which is the length.
Is it correct ah?
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