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# If the perimeter of a rectangular garden plot is 40 feet and its area

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Math Expert
Joined: 02 Sep 2009
Posts: 49258
If the perimeter of a rectangular garden plot is 40 feet and its area  [#permalink]

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29 Aug 2018, 01:42
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Difficulty:

15% (low)

Question Stats:

89% (01:35) correct 11% (00:28) wrong based on 27 sessions

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If the perimeter of a rectangular garden plot is 40 feet and its area is 84 square feet, what is the length of one of the longer sides?

A. 6
B. 12
C. 14
D. 24
E. 28

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Joined: 23 Apr 2018
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If the perimeter of a rectangular garden plot is 40 feet and its area  [#permalink]

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Updated on: 29 Aug 2018, 02:51
2(L+B)=40 given 1
L*B=84 given 2

From 1
L+B=40/2
L+B=20
14 & 4 fit, both the equations, therefore 14 is the answer
Option (c)

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Originally posted by Shrey9 on 29 Aug 2018, 01:51.
Last edited by Shrey9 on 29 Aug 2018, 02:51, edited 1 time in total.
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Re: If the perimeter of a rectangular garden plot is 40 feet and its area  [#permalink]

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29 Aug 2018, 01:52
Perimeter of a rectangle = 2(L+W)

Given 2(L+W) = 40

Then L+W = 20.

Also Given, LW = 84

Only possible pair which satisfies the above criteria is (14,4)

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Re: If the perimeter of a rectangular garden plot is 40 feet and its area  [#permalink]

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29 Aug 2018, 07:51
Bunuel wrote:
If the perimeter of a rectangular garden plot is 40 feet and its area is 84 square feet, what is the length of one of the longer sides?

A. 6
B. 12
C. 14
D. 24
E. 28

There exists a shortcut formula -

$$P=2l+\frac{2A}{l}$$ { Where P = Perimeter , A = Area & l = Length }

So, $$40 = 2l + \frac{84}{l}$$

Now, check using options, Answer must be (C) 14
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Re: If the perimeter of a rectangular garden plot is 40 feet and its area &nbs [#permalink] 29 Aug 2018, 07:51
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