How many newspapers were sold at a certain newsstand today? : GMAT Data Sufficiency (DS)
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# How many newspapers were sold at a certain newsstand today?

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How many newspapers were sold at a certain newsstand today? [#permalink]

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09 Jan 2014, 05:49
00:00

Difficulty:

5% (low)

Question Stats:

86% (01:41) correct 14% (00:35) wrong based on 308 sessions

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The Official Guide For GMAT® Quantitative Review, 2ND Edition

How many newspapers were sold at a certain newsstand today?

(1) A total of 100 newspapers were sold at the newsstand yesterday, 10 fewer than twice the number sold today.
(2) The number of newspapers sold at the newsstand yesterday was 45 more than the number sold today.

Data Sufficiency
Question: 26
Category: Algebra First- and second-degree equations
Page: 155
Difficulty: 600

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Re: How many newspapers were sold at a certain newsstand today? [#permalink]

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09 Jan 2014, 05:49
SOLUTION

How many newspapers were sold at a certain newsstand today?

Say x is the number of newspapers sold today.

(1) A total of 100 newspapers were sold at the newsstand yesterday, 10 fewer than twice the number sold today --> 100 = 2x - 10. We can solve for x. Sufficient.

(2) The number of newspapers sold at the newsstand yesterday was 45 more than the number sold today. Clearly insufficient.

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Re: How many newspapers were sold at a certain newsstand today? [#permalink]

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09 Jan 2014, 22:02
Let the no. of newspapers sold today be t and yesterday be y.
Question: t=?

(1). y = 100;
Also, y = 2t-10;
=> 100 = 2t-10;
2t = 110; t = 55;

Sufficient.

(2). y = t + 45; Insufficient because of 2 variables in the statement.

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Re: How many newspapers were sold at a certain newsstand today? [#permalink]

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10 Jan 2014, 10:27
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

How many newspapers were sold at a certain newsstand today?

(1) A total of 100 newspapers were sold at the newsstand yesterday, 10 fewer than twice the number sold today.
(2) The number of newspapers sold at the newsstand yesterday was 45 more than the number sold today.

Statement 1) 100 = 2todays -10 => Todays we can determine. Sufficient.
Statement 2) We need to have the value of newspaper sold yesterday to determine today's. Not Sufficient.

Hence Option A)
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Math Expert
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Kudos [?]: 93564 [0], given: 10578

Re: How many newspapers were sold at a certain newsstand today? [#permalink]

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11 Jan 2014, 06:31
SOLUTION

How many newspapers were sold at a certain newsstand today?

Say x is the number of newspapers sold today.

(1) A total of 100 newspapers were sold at the newsstand yesterday, 10 fewer than twice the number sold today --> 100 = 2x - 10. We can solve for x. Sufficient.

(2) The number of newspapers sold at the newsstand yesterday was 45 more than the number sold today. Clearly insufficient.

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Re: How many newspapers were sold at a certain newsstand today? [#permalink]

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20 Dec 2015, 14:39
t = ?

Statement I:

y =100
2t-10 = 100
2t = 100-10
t=90/2 = 45

Statement II:

y = 45 + t
t = ? unknown.
Cannot resolve two variable in one equation.
Not Sufficient

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Re: How many newspapers were sold at a certain newsstand today?   [#permalink] 20 Dec 2015, 14:39
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