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QOTD#25 Evangeline must spend of her weekly salary on rent a

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GRE Prep Club Legend
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Joined: 07 Jun 2014
Posts: 4857
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
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Kudos [?]: 1833 [0], given: 397

QOTD#25 Evangeline must spend of her weekly salary on rent a [#permalink] New post 30 Apr 2017, 14:14
Expert's post
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Question Stats:

47% (01:44) correct 52% (02:28) wrong based on 17 sessions
Evangeline must spend \(\frac{3}{8}\) of her weekly salary on rent and \(\frac{1}{6}\) of her remaining salary on food. Which of the following could be percentages of her weekly salary that Evangeline devotes to entertainment, while still enabling her to place \(\frac{4}{9}\) of her salary into a savings account?

Indicate all such percentages.

A. 0.5%
B. 5.0%
C. 7.5%
D. 10.0%
E. 15.0%
F. 25.0%
G. 50.0%

[Reveal] Spoiler: Answer
A, B, C


Drill 4
Question: 13
Page: 323
[Reveal] Spoiler: OA

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Sandy
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GRE Prep Club Legend
GRE Prep Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4857
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 107

Kudos [?]: 1833 [0], given: 397

Re: QOTD#25 Evangeline must spend of her weekly salary on rent a [#permalink] New post 04 May 2017, 01:35
Expert's post
Explanation

The problem has percents in the answers and no real values in the question, so it’s a Hidden Plug In; the hidden variable in this case is Evangeline’s weekly salary.

To find an easy number, try multiplying the denominators in the problem: \(8 \times 6 \times 9 = 432\), so Evangeline makes \($432\)per week. Now work the problems in bite-sized pieces.

She spends \(\frac{3}{8} \times $432 = $ 162\) on rent, leaving her with \($432 - $162 = $270\).

Of that, she spends , \(\frac{1}{6}\) or $45, on food, leaving her with \($270 - $45 = $225\).

If she wants to put \(\frac{4}{9}\) of her weekly salary, or $192, into a savings account, then she can only spend \($225 - $192 = $33\) on entertainment.

Finally, use your onscreen calculator to determine that 33 is just over 7.6% of 432, so choices (A), (B), and (C) will all work.
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Sandy
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Re: QOTD#25 Evangeline must spend of her weekly salary on rent a [#permalink] New post 14 Dec 2018, 15:20
Full disclosure: Sandy's way may be faster for you.

Let S = Weekly salary

Here is what we know

3/8(S) = rent
1/6 (5/8)S = food (because she spends 1/6 of what is remaining after rent, what is remaining after rent is 5/8 S)
4/9S = savings

And finally, the amount ratio/percentage of entertainment is unknown, we label it x.
x(s) = entertainment

Now note, if we add up all of these, we should get her total salary, no more (but possibly less)

3/8 S + 5/38 S + 4/9 S + x S <= S
3/8 + 5/38 + 4/9 S + x <= 1
x <= .076

Thus, A, B, and C are the answers.
Re: QOTD#25 Evangeline must spend of her weekly salary on rent a   [#permalink] 14 Dec 2018, 15:20
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QOTD#25 Evangeline must spend of her weekly salary on rent a

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