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A museum sold 30 tickets on Saturday. Some of the tickets

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A museum sold 30 tickets on Saturday. Some of the tickets [#permalink] New post 11 Jun 2012, 07:14
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A museum sold 30 tickets on Saturday. Some of the tickets sold were $10 general exhibit tickets and the rest were $70 special exhibit tickets. How many general exhibit tickets did the museum sell on Saturday?

(1) The museum’s total revenue from ticket sales on Saturday was greater than $1,570 and less than $1670.
(2) The museum sold more than 20, but fewer than 25, special exhibit ticket on Saturday.

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Re: A museum sold 30 tickets on Saturday [#permalink] New post 11 Jun 2012, 07:37
Hi,

let there be x tickets sold at $10,
so, the tickets sold at $70 would be (30-x).
and total revenue would be: $10(x)+$70(30-x)

Using (1)
1570 < 10(x)+70(30-x) < 1670
or 1570 < 10x + 2100 - 70x < 1670
or 1570-2100 < -60x < 1670-2100
or -530 < -60x < -430 (multiply by -1)
or 430 < 60x < 530
or 7.16 < x < 8.33,
since x is integer and only one value exist between 7.1 & 8.3, i.e., 8
thus, x=8. Sufficient.

Using (2),
20 < special exhibit ticket < 25
or 20 < 30-x < 25
or -10 < -x < 5
or 5 < x <10,
thus, x = 6, 7, 8, 9
Clearly, not sufficient.

Thus, Answer is (A).

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Re: A museum sold 30 tickets on Saturday [#permalink] New post 11 Jun 2012, 08:03
i did following:
General=G Special=S
G+S =30
70*S+ 30*G= Revenue

Statement 1:
1570<Revenue<1670

70*S+70*G=2100
70*S+ 30*G= 1660 [Within the range]

40G=440
G=11

70*S+70*G=2100
70*S+ 30*G= 1620 [Within the range]

40G= 480
G=12

I am having multiple integer value for General tickets G[11, 12]. What am i doing wrong?
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Re: A museum sold 30 tickets on Saturday. Some of the tickets [#permalink] New post 11 Jun 2012, 08:04
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A museum sold 30 tickets on Saturday. Some of the tickets sold were $10 general exhibit tickets and the rest were $70 special exhibit tickets. How many general exhibit tickets did the museum sell on Saturday?

Say the museum sold G general exhibit tickets and 30-G special exhibit tickets, then the museum's total revenue wold be 10G+70(30-G)=2100-60G.

(1) The museum’s total revenue from ticket sales on Saturday was greater than $1,570 and less than $1670 --> 1570<2100-60G<1670 --> -530<-60G<-430 --> reduce by -10 and flip the sign: 43<6G<53 --> since G must be an integer then G=8. Sufficient.

(2) The museum sold more than 20, but fewer than 25, special exhibit ticket on Saturday --> 20<S<25 --> S could be be 21, 22, 23 or 24, so G could be 9, 8, 7, or 6 respectively. Not sufficient.

Answer: A.

Hope it's clear.
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Re: A museum sold 30 tickets on Saturday [#permalink] New post 11 Jun 2012, 08:14
Expert's post
BDSunDevil wrote:
i did following:
General=G Special=S
G+S =30
70*S+ 30*G= Revenue

Statement 1:
1570<Revenue<1670

70*S+70*G=2100
70*S+ 30*G= 1660 [Within the range]

40G=440
G=11

70*S+70*G=2100
70*S+ 30*G= 1620 [Within the range]

40G= 480
G=12

I am having multiple integer value for General tickets G[11, 12]. What am i doing wrong?


Revenue=70S+10G not 70S+30G.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Expert Post
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Re: A museum sold 30 tickets on Saturday. Some of the tickets [#permalink] New post 23 Feb 2014, 05:35
Expert's post
Re: A museum sold 30 tickets on Saturday. Some of the tickets   [#permalink] 23 Feb 2014, 05:35
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