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A developer has land that has x feet of lake frontage. The l

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A developer has land that has x feet of lake frontage. The l [#permalink] New post 24 Jan 2017, 07:44
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A developer has land that has x feet of lake frontage. The land is to be subdivided into lots, each of which is to have either 80 feet or 100 feet of lake frontage. If 1/9 of the lots are to have 80 feet of frontage each and the remaining 40 lots are to have 100 feet of frontage each, what is the value of x?

A) 400

B) 3,200

C) 3,700

D) 4,400

E) 4,760
[Reveal] Spoiler: OA

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Re: A developer has land that has x feet of lake frontage. The l [#permalink] New post 28 Jan 2017, 07:37
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Explanation

We start by finding the number of lots: \(\frac{1}{9}\) of the total lots + 40 lots = total lots and let total lots = t
\(\frac{1}{9} t + 40 = t\) → \((9)\times \frac{1}{9} \times t + (9) \times 40 = 9t\) → \(1t + 360 = 9t\)

Hence \(360 = 8t\) → \(45 = t\).

If there are 45 total lots and 40 of them have 100 feet of frontage, then 5 of them have 80 feet of frontage. Determine the total frontage:

40 have 100 feet: 40 × 100 = 4000
5 have 80 feet: 5 × 80 = 400

Total Frontage = 4000 + 400 = 4400.


Hence option D is correct.
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Re: GRE Math Challenge #79-developer has land that has x feet of [#permalink] New post 14 Dec 2017, 05:08
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sandy wrote:
A developer has land that has x feet of lake frontage. The land is to be subdivided into lots, each of which is to have either 80 feet or 100 feet of Lake Frontage. If (1/9) of the lots are to have 80 feet of frontage each and the remaining 40 lots are to have 100 feet of frontage each, what is the value of x?

(A) 400
(B) 3,200
(C) 3,700
(D) 4,400
(E) 4,760



Here
First we need to find the total Lots after that we can find the value of x

Let total lots = P
lots with 80 feet = \(\frac{1}{9}\)

SO the lots with 100 feet = \(\frac{8}{9}\)

Therefore lots for 100 feet = \(\frac{8}{9} * p\) = 40 (since the remaining 40 plot are to have 100 feet)

or p = 45 lots

Now Total feet x = total lot for 80 feet + total lot for 100 feet

= \({(\frac{1}{9} * 45) * 80}\) \(+\) \({(\frac{8}{9} * 45) * 100}\) = 4400
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Re: A developer has land that has x feet of lake frontage. The l [#permalink] New post 08 Nov 2018, 07:26
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Alternate approach

For finding the value of t we can equate

\(\frac{8}{9} t =40\) (because from the question if \(\frac{1}{9}\) lots are of \(80\) ft then the rest \(\frac{8}{9}\) t must be of 100 feet)
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Re: A developer has land that has x feet of lake frontage. The l [#permalink] New post 20 Jun 2019, 06:06
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Carcass wrote:


A developer has land that has x feet of lake frontage. The land is to be subdivided into lots, each of which is to have either 80 feet or 100 feet of lake frontage. If 1/9 of the lots are to have 80 feet of frontage each and the remaining 40 lots are to have 100 feet of frontage each, what is the value of x?

A) 400
B) 3,200
C) 3,700
D) 4,400
E) 4,760


Side question: Why is this developer so vague with the lake frontage numbers? Seems a little shady if you ask me :problem:

Here's a super fast approach


GIVEN: ....the remaining 40 lots are to have 100 feet of frontage each
(40)(100 ft) = 4000 ft.
So, the lake frontage must be longer than 4000 ft.
ELIMINATE A, B, and C

Let's check the 2 remaining answer choices...

D) The TOTAL length of the lakefront (aka x) is 4400 feet
4000 feet is comprised of 100-foot lots
4400 - 4000 = 400.
So, the other 400 feet is comprised of 80-foot lots.
This means there are 5 80-foot lots.
Looks okay.


E) The TOTAL length of the lakefront (aka x) is 4760 feet
4760 - 4000 = 760.
So, the other 760 feet is comprised of 80-foot lots.
Since 80 feet does not divide into 760 feet, answer choice E is impossible.
ELIMINATE E

By the process of elimination, the correct answer is E :done

Cheers,
Brent
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Re: A developer has land that has x feet of lake frontage. The l [#permalink] New post 11 Aug 2019, 22:49
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Carcass wrote:


A developer has land that has x feet of lake frontage. The land is to be subdivided into lots, each of which is to have either 80 feet or 100 feet of lake frontage. If 1/9 of the lots are to have 80 feet of frontage each and the remaining 40 lots are to have 100 feet of frontage each, what is the value of x?

A) 400

B) 3,200

C) 3,700

D) 4,400

E) 4,760


Here,

Let the total Lots be = T
Given,
\(\frac{1}{9} * T\) will have 80 feet frontage

so the remaining lots = \(1 - \frac{1}{9} = \frac{8}{9}\) will have 100 feet frontage

As per ques,

remaining lots is 40 - they have 100 feet frontage.

or \(\frac{8}{9} *T = 40\)

or \(T = 45\) lots.

Therefore \(40\) Lots will have = \(40 * 1000 = 4000\) feet frontage.

Now,

\(\frac{1}{9}\)of Total Lots = \(\frac{1}{9} * 45 = 5\) lots

These \(5\) lots will have = \(5 * 80 = 400\)feet frontage

Hence Total feet = \(4000 + 400 = 4400\)
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Re: A developer has land that has x feet of lake frontage. The l [#permalink] New post 12 Dec 2019, 21:30
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The easiest response to the question is:

Lets divide the land into 1/9 and 8/9 of lots
8/9 of the land (40 lots) has 100 feet, So the remaining lots are 5 lots ( 1/9 of the land) which have 80 feet so that:
40*1000 + 80*5 = 4400
Re: A developer has land that has x feet of lake frontage. The l   [#permalink] 12 Dec 2019, 21:30
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