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The only gift certificates that a certain store sold

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The only gift certificates that a certain store sold [#permalink] New post 25 Jun 2012, 01:58
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Question Stats:

46% (02:47) correct 54% (01:29) wrong based on 217 sessions
The only gift certificates that a certain store sold yesterday were worth either $100 each or $10 each. If the store sold a total of 20 gift certificates yesterday, how many gift certificates worth $10 each did the store sell yesterday?

(1) The gift certificates sold by the store yesterday were worth a total of between $1,650 and $1,800.
(2) Yesterday the store sold more than 15 gift certificates worth $100 each.

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Question: 30
Page: 25
Difficulty: 600
[Reveal] Spoiler: OA

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Re: The only gift certificates that a certain store sold [#permalink] New post 25 Jun 2012, 01:59
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SOLUTION

The only gift certificates that a certain store sold yesterday were worth either $100 each or $10 each. If the store sold a total of 20 gift certificates yesterday, how many gift certificates worth $10 each did the store sell yesterday?

Say the number of $100 certificates sold was x, then the number of $10 certificates sold was 20-x.

(1) The gift certificates sold by the store yesterday were worth a total of between $1,650 and $1,800 --> 1,650<100x+10(20-x)<1,800 --> 1,650<90x+200<1,800 --> 1,450<90x<1,600 --> 145<9x<160 --> 16.1<x<17.8. Since x is an integer then x=17. Sufficient.

(2) Yesterday the store sold more than 15 gift certificates worth $100 each --> x>15. Clearly insufficient.

Answer: A.
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Re: The only gift certificates that a certain store sold [#permalink] New post 25 Jun 2012, 07:57
Hi,

Difficulty level: 650

Let's say,
Number of gift certificates worth $100 = x
Number of gift certificates worth $10 = y
and x+y=20

Using (1),
1650<100x+10y<1800
or 165<10x+y<180
or 165<20+9x<180 (given, x+y=20)
or 145<9x<160
or 145/9<x<160/9
or 16.1< x < 17.7
Thus, x = 17. Sufficient.

Using (2),
x > 15. Insufficient.

Answer (A),

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Re: The only gift certificates that a certain store sold [#permalink] New post 25 Jun 2012, 17:46
(1) The gift certificates sold by the store yesterday were worth a total of between $1 ,650 and $1,800.

Suff as only one combination of $100 and $10 GC is possible for total ranging from 1650-1800 i.e 17 ($100) and 3 ($10) total 1730, all other combinations within this range do not meet total number of GC condition

(2) Yesterday the store sold more than 15 gift certificates worth $100 each

Insuff as more than 15 can mean 16 and 4, 17 and 3, 18 and 2

THerefore A
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Re: The only gift certificates that a certain store sold [#permalink] New post 25 Jun 2012, 23:30
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Hi,

Difficulty level: 600

Number of gift certificates worth $100 = x
Number of gift certificates worth $10 = y
and x+y=20
Statement (1)
1650 < x+y < 1800 This gives us only one possible solution... 1730
Since there has to be 20 gift certificates and x=100$ and y=10$, 1730 is the only number that is between 1650 and 1800 that corresponds with 20 gift certificates
Every other solution is out of range e.g. 16 x 100$ + 4 x 10$ = 1640$ or 18 x 100$ + 2 x 10$ = 1820$, both out of the range 1650 < x+y < 1800

Statement (2) clearly insufficient since you can have more than one possible solution.
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Re: The only gift certificates that a certain store sold [#permalink] New post 26 Jun 2012, 13:52
x+y = 20

st1.) 1650<100x+10y<1800
with ths eqn and x+y = 20
sufficient

st.2) x>15
not sufficient

Answer A.
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Re: The only gift certificates that a certain store sold [#permalink] New post 29 Jun 2012, 03:10
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SOLUTION

The only gift certificates that a certain store sold yesterday were worth either $100 each or $10 each. If the store sold a total of 20 gift certificates yesterday, how many gift certificates worth $10 each did the store sell yesterday?

Say the number of $100 certificates sold was x, then the number of $10 certificates sold was 20-x.

(1) The gift certificates sold by the store yesterday were worth a total of between $1,650 and $1,800 --> 1,650<100x+10(20-x)<1,800 --> 1,650<90x+200<1,800 --> 1,450<90x<1,600 --> 145<9x<160 --> 16.1<x<17.8. Since x is an integer then x=17. Sufficient.

(2) Yesterday the store sold more than 15 gift certificates worth $100 each --> x>15. Clearly insufficient.

Answer: A.
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The only gift certificates that a certain store sold [#permalink] New post 25 Dec 2012, 00:35
Is this a trap question?

That is the intentions of the writer is to make you think that you need 1 and 2 to be able to get the correct answer.

because 2 is obviously not correct and if you weren't able to do 1 properly, you would have to automatically assume that 2 is required.

It seems like it is always advantageous to simply pick the A (or whatever is the harder stem) in these types of questions.
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Re: The only gift certificates that a certain store sold [#permalink] New post 28 Dec 2012, 17:50
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Yes, this question pretty much wants you to understand that A alone is sufficient, otherwise the fallback answer would be C. St II is obviously not sufficient by itself.
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Re: The only gift certificates that a certain store sold [#permalink] New post 06 Jul 2014, 02:46
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Re: The only gift certificates that a certain store sold   [#permalink] 06 Jul 2014, 02:46
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