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Alice and Bob went shopping in a new mall. Alice spends half of her sh

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Alice and Bob went shopping in a new mall. Alice spends half of her sh [#permalink]

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New post 11 Aug 2015, 13:06
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A
B
C
D
E

Difficulty:

  95% (hard)

Question Stats:

49% (01:16) correct 51% (01:22) wrong based on 116 sessions

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Alice and Bob went shopping in a new mall. Alice spends half of her shopping budget on shoes and 20% of her shopping budget on shirts, while Bob spends 20% of his budget on shoes and 8% of his budget on shirts. If no further purchases were made by either of Alice or Bob, How much did Alice spend in the new mall?

(1) Together, Alice and Bob bought shoes for $600.
(2) Together, Alice and Bob bought shirts for $240.
[Reveal] Spoiler: OA

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Re: Alice and Bob went shopping in a new mall. Alice spends half of her sh [#permalink]

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New post 11 Aug 2015, 19:46
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Correct answer E:

Let A be Alice's budget, and B be Bob's budget.

Alice spent total of = A/2 + A/5
Bob spend total of = B/5 + B/12.5

Question is, what is A?

(1) => A/2 + B/5 = 600

1 Equation 2 unknowns. Insuff.

(2) A/5 + B/12.5 = 240

Again 1 equation 2 unknowns.

(1) + (2)
=>
A/2 + B/5 = 600
A/5 + B/12.5 = 240

They are the same equation
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Re: Alice and Bob went shopping in a new mall. Alice spends half of her sh [#permalink]

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New post 12 Aug 2015, 09:16
Classic trap. Always look for it in this kind of question!
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Re: Alice and Bob went shopping in a new mall. Alice spends half of her sh [#permalink]

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New post 12 Aug 2015, 09:25
Mascarfi wrote:
Classic trap. Always look for it in this kind of question!


It is very similar to selecting E (statements combined are not sufficeint) when you see a quadratic equation as a quadratic equation x^2+2x+1 = 0 will have 2 SAME values and thus in this case you will mark A or B or C (statements combined are sufficient) or D but not E.

So, to summarize, whenever you encounter a system of linear equations or a quadratic equation, make sure to check whether you will be getting a unique value of a set of values.
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Re: Alice and Bob went shopping in a new mall. Alice spends half of her sh [#permalink]

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New post 05 Feb 2018, 21:13
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Re: Alice and Bob went shopping in a new mall. Alice spends half of her sh   [#permalink] 05 Feb 2018, 21:13
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