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In Greensboro County, 75 people own a television and 35 [#permalink]

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24 Mar 2012, 10:36

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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 ?

Re: In Greensboro County, 75 people own a television and 35 [#permalink]

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27 Mar 2012, 09:30

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Expert's post

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.

Re: In Greensboro County, 75 people own a television and 35 [#permalink]

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29 Jun 2013, 11:18

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.

Re: In Greensboro County, 75 people own a television and 35 [#permalink]

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29 Jun 2013, 12:54

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.

Re: In Greensboro County, 75 people own a television and 35 [#permalink]

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17 Aug 2013, 08:49

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

Rgds, TGC ! _________________

Rgds, TGC! _____________________________________________________________________ I Assisted You => KUDOS Please _____________________________________________________________________________

Re: In Greensboro County, 75 people own a television and 35 [#permalink]

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17 Aug 2013, 09:56

1

This post received KUDOS

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) _________________

Asif vai.....

gmatclubot

Re: In Greensboro County, 75 people own a television and 35
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17 Aug 2013, 09:56

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