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The figure above shows a circular garden plot with center O

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The figure above shows a circular garden plot with center O [#permalink] New post 07 Jun 2017, 02:04
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The figure above shows a circular garden plot with center O surrounded by a circular sidewalk, also with center O. If the area covered by the garden and sidewalk together is 169p and of the garden alone is 144p, what is the value of t ?

A) 1

B) 2

C) 3

D 5

E) 12.5
[Reveal] Spoiler: OA

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Re: The figure above shows a circular garden plot with center O [#permalink] New post 20 Sep 2017, 05:48
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The radius of the larger circle is sqrt(169) = 13, while the radius of the inner one is sqrt(144)=12. Thus t = 1. Answer A!
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Re: The figure above shows a circular garden plot with center O [#permalink] New post 22 Sep 2017, 13:43
Carcass wrote:


Image

The figure above shows a circular garden plot with center O surrounded by a circular sidewalk, also with center O. If the area covered by the garden and sidewalk together is 169p and of the garden alone is 144p, what is the value of t ?

A) 1

B) 2

C) 3

D 5

E) 12.5


Here thus p stands for pi?
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Director
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Re: The figure above shows a circular garden plot with center O [#permalink] New post 11 Oct 2017, 07:45
pranab01 wrote:
Carcass wrote:


Image

The figure above shows a circular garden plot with center O surrounded by a circular sidewalk, also with center O. If the area covered by the garden and sidewalk together is 169p and of the garden alone is 144p, what is the value of t ?

A) 1

B) 2

C) 3

D) 5

E) 12.5


Here thus p stands for pi?


Yes it is
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Re: The figure above shows a circular garden plot with center O [#permalink] New post 30 Jan 2018, 12:38
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Let, x= radius for inner circle
Area covered by the garden and sidewalk is pi*(x+t)^2=169pi or, (x+t)=13
Area covered by the garden alone is pi*x^2=122pi or, x=12
So x+t-x=13-12 or, t=1
So the answer is A
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Re: The figure above shows a circular garden plot with center O [#permalink] New post 03 Feb 2018, 03:59
Thank you.
Re: The figure above shows a circular garden plot with center O   [#permalink] 03 Feb 2018, 03:59
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The figure above shows a circular garden plot with center O

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