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In Greensboro County, 75 people own a television and 35

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In Greensboro County, 75 people own a television and 35 [#permalink] New post 24 Mar 2012, 09:36
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66% (04:10) correct 34% (02:41) wrong based on 44 sessions
In Greensboro County, 75 people own a television and 35 people own a radio. The number of people who own both a television and a radio plus the number of people who own neither is half the amount of the people who own either. If the ratio of people who own both to the people who own neither is 5:6 how many people live in the county ?

A 55
B 85
C 105
D 110
E 115

The correct ans is E. How ?
[Reveal] Spoiler: OA
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Re: In Greensboro County, 75 people own a television and 35 [#permalink] New post 27 Mar 2012, 07:24
something is wrong with this question.. can someone else take a look and confirm?

been spinning my wheels on this for like 45 mins..

I keep getting results that make no sense
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Re: In Greensboro County, 75 people own a television and 35 [#permalink] New post 27 Mar 2012, 08:30
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AbeinOhio wrote:
something is wrong with this question.. can someone else take a look and confirm?

been spinning my wheels on this for like 45 mins..

I keep getting results that make no sense


That's because the question is flawed.

In Greensboro County, 75 people own a television and 35 people own a radio. The number of people who own both a television and a radio plus the number of people who own neither is half the amount of the people who own either. If the ratio of people who own both to the people who own neither is 5:6 how many people live in the county ?
A 55
B 85
C 105
D 110
E 115

Given: "75 people own a television and 35 people own a radio", so we have that: total=75+35-{both}+{neither}, say {both}=x and {neither}=y --> total=75+35-x+y;

"The number of people who own both a television and a radio plus the number of people who own neither is half the amount of the people who own either": x+y=(75+35-x)/2;

"The ratio of people who own both to the people who own neither is 5:6": x/y=5/6.

Now, if you solve x+y=(75+35-x)/2 and x/y=5/6 you won't get integer values for x and y, as you should (they represent # of people). So, there is something wrong with the question.

Based on the OA saying that total=115, Kaplan (if it's really their question) writes first equation as x+y=(75+35)/2, which is wrong because the # of people who own either a television or a radio is 75+35-{both}, we are subtracting {both} to avoid doublecounting of that group, since it's included both in 75 and in 35. But if you solve their version of equations: x+y=(75+35)/2 and x/y=5/6 you'll get x=25 and y=30 --> substitute it in initial equation: total=75+35-x+y=75+35-25+30=115, the answer they got as correct.

Hope it's clear.
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Re: In Greensboro County, 75 people own a television and 35 [#permalink] New post 28 Mar 2012, 01:36
I think the word either here implies 'any' i.e either television or radio.
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Re: In Greensboro County, 75 people own a television and 35 [#permalink] New post 28 Mar 2012, 01:40
Expert's post
stevie1111 wrote:
I think the word either here implies 'any' i.e either television or radio.


"The amount of the people who own either" means people who own either TV or radio or both, which is 75+35-{both}.
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Re: In Greensboro County, 75 people own a television and 35 [#permalink] New post 29 Jun 2013, 10:18
Bunuel wrote:
AbeinOhio wrote:
something is wrong with this question.. can someone else take a look and confirm?

been spinning my wheels on this for like 45 mins..

I keep getting results that make no sense


That's because the question is flawed.

In Greensboro County, 75 people own a television and 35 people own a radio. The number of people who own both a television and a radio plus the number of people who own neither is half the amount of the people who own either. If the ratio of people who own both to the people who own neither is 5:6 how many people live in the county ?
A 55
B 85
C 105
D 110
E 115

Given: "75 people own a television and 35 people own a radio", so we have that: total=75+35-{both}+{neither}, say {both}=x and {neither}=y --> total=75+35-x+y;

"The number of people who own both a television and a radio plus the number of people who own neither is half the amount of the people who own either": x+y=(75+35-x)/2;

"The ratio of people who own both to the people who own neither is 5:6": x/y=5/6.

Now, if you solve x+y=(75+35-x)/2 and x/y=5/6 you won't get integer values for x and y, as you should (they represent # of people). So, there is something wrong with the question.

Based on the OA saying that total=115, Kaplan (if it's really their question) writes first equation as x+y=(75+35)/2, which is wrong because the # of people who own either a television or a radio is 75+35-{both}, we are subtracting {both} to avoid doublecounting of that group, since it's included both in 75 and in 35. But if you solve their version of equations: x+y=(75+35)/2 and x/y=5/6 you'll get x=25 and y=30 --> substitute it in initial equation: total=75+35-x+y=75+35-25+30=115, the answer they got as correct.

Hope it's clear.




bunnel. a different question
Of a group of people, 10 play piano, 11 play guitar, 14 play violin, 3 play all the instruments, 20 play only one instrument. How many play 2 instruments?

A. 3
B. 6
C. 9
D. 12
E. 15
can v solve this with your 2 formulas u mentioned
t=a+b+c -(sum of 2)+all 3+ neither
t=a+b+c -(sum of exactly 2)-2*all 3+ neither
if not then any other shortcut or formula.
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Re: In Greensboro County, 75 people own a television and 35 [#permalink] New post 29 Jun 2013, 11:54
Expert's post
prbhtsngr wrote:
Bunuel wrote:
AbeinOhio wrote:
something is wrong with this question.. can someone else take a look and confirm?

been spinning my wheels on this for like 45 mins..

I keep getting results that make no sense


That's because the question is flawed.

In Greensboro County, 75 people own a television and 35 people own a radio. The number of people who own both a television and a radio plus the number of people who own neither is half the amount of the people who own either. If the ratio of people who own both to the people who own neither is 5:6 how many people live in the county ?
A 55
B 85
C 105
D 110
E 115

Given: "75 people own a television and 35 people own a radio", so we have that: total=75+35-{both}+{neither}, say {both}=x and {neither}=y --> total=75+35-x+y;

"The number of people who own both a television and a radio plus the number of people who own neither is half the amount of the people who own either": x+y=(75+35-x)/2;

"The ratio of people who own both to the people who own neither is 5:6": x/y=5/6.

Now, if you solve x+y=(75+35-x)/2 and x/y=5/6 you won't get integer values for x and y, as you should (they represent # of people). So, there is something wrong with the question.

Based on the OA saying that total=115, Kaplan (if it's really their question) writes first equation as x+y=(75+35)/2, which is wrong because the # of people who own either a television or a radio is 75+35-{both}, we are subtracting {both} to avoid doublecounting of that group, since it's included both in 75 and in 35. But if you solve their version of equations: x+y=(75+35)/2 and x/y=5/6 you'll get x=25 and y=30 --> substitute it in initial equation: total=75+35-x+y=75+35-25+30=115, the answer they got as correct.

Hope it's clear.




bunnel. a different question
Of a group of people, 10 play piano, 11 play guitar, 14 play violin, 3 play all the instruments, 20 play only one instrument. How many play 2 instruments?

A. 3
B. 6
C. 9
D. 12
E. 15
can v solve this with your 2 formulas u mentioned
t=a+b+c -(sum of 2)+all 3+ neither
t=a+b+c -(sum of exactly 2)-2*all 3+ neither
if not then any other shortcut or formula.


This question is discussed here: of-a-group-of-people-10-play-piano-11-play-guitar-14-play-86070.html
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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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Re: In Greensboro County, 75 people own a television and 35 [#permalink] New post 17 Aug 2013, 07:49
Hi Folks ,

One query on this question:

The number of people who own both a television and a radio plus the number of people who own neither is half the amount of the people who own either.

Does this language says :

x+y = (1/2){75+35-2x} (As Either should mean Either of the two => Only Radio + Only Tele)

Or does it says:

x+y = (1/2){75+35-x} (As [ A U B = A + B - (A intersection B)] where U implies Union/OR)

Please clarify

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TGC !
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Re: In Greensboro County, 75 people own a television and 35 [#permalink] New post 17 Aug 2013, 08:32
Well i agree with TGC.
Since either means means either radio or Either TV..
Equation will be:

1/2{120-2(Both)}

Anyways, there is some problem with question.
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Re: In Greensboro County, 75 people own a television and 35 [#permalink] New post 17 Aug 2013, 08:56
shahlanuk wrote:
In Greensboro County, 75 people own a television and 35 people own a radio. The number of people who own both a television and a radio plus the number of people who own neither is half the amount of the people who own either. If the ratio of people who own both to the people who own neither is 5:6 how many people live in the county ?

A 55
B 85
C 105
D 110
E 115

The correct ans is E. How ?

Here,
T = 75 and R = 35
x = have neither and (T n R) = have both And the ratio = (T n R)/x = 5/6
from question,

(T n R) + x = 1/2 (T+R) or, x = 30 (using above values in the calculations)

Now, (T n R) = 5/6 × 30 = 25

So only T = 75-25=50
only R = 35-25 = 10

So total people = 50+10+ 30 + 25 = 115 (Answer)
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Re: In Greensboro County, 75 people own a television and 35   [#permalink] 17 Aug 2013, 08:56
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