A manufacturer conducted a survey to determine how many people buy products P and Q. What fraction of the people surveyed said that they buy neither product P nor product Q?
1. one third of the people surveyed said that they buy product P but not product Q
2. one half of the people surveyed said that they buy product Q
OA: C
DS: Fractions
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- rishab1988
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This is set theory question.Unfortunately,I can't draw the Venn diagram,but I will try to explain as lucidly as I can.
Let P= only product P
Q= only product Q
x = both P and Q
N = neither P nor Q
Total no of people = P+Q+x+N
We are asked what is N/(P+Q+x+N)=? or N/T=?
1) For simplicity assume T=30 (because it is easily divisible by 10)
P=10
We are given no info about Q and x(we need this info to find N).Therefore, we can't find the ratio.
Hence insufficient.Eliminate A and D
2) T=30
Q+x=1/2(30)=15 (reason because the statement does not say Q but not P,as in 1)
Again Insufficient because we need P to find N.P could be anything.
Eliminate B
Combining 1 and 2
P=10 from 1 and Q+x=15 from 2
Therefore N=5
Ratio =5/30=1/6
Sufficient Answer is C
Alternatively, you could also have used algebra.
Let T=a
1) p=a/3
Ratio = N/a ( we don't know what fraction of total people is Q+x)
Insufficient
2) similarly 2 is insufficient
from 1 and 2
P=a/3
Q+x=a/2
N= a-a/2-a/3= 1/6a(6-3-2)=1/6a
T=a
N/T= 1/6
What is the OA?
Let P= only product P
Q= only product Q
x = both P and Q
N = neither P nor Q
Total no of people = P+Q+x+N
We are asked what is N/(P+Q+x+N)=? or N/T=?
1) For simplicity assume T=30 (because it is easily divisible by 10)
P=10
We are given no info about Q and x(we need this info to find N).Therefore, we can't find the ratio.
Hence insufficient.Eliminate A and D
2) T=30
Q+x=1/2(30)=15 (reason because the statement does not say Q but not P,as in 1)
Again Insufficient because we need P to find N.P could be anything.
Eliminate B
Combining 1 and 2
P=10 from 1 and Q+x=15 from 2
Therefore N=5
Ratio =5/30=1/6
Sufficient Answer is C
Alternatively, you could also have used algebra.
Let T=a
1) p=a/3
Ratio = N/a ( we don't know what fraction of total people is Q+x)
Insufficient
2) similarly 2 is insufficient
from 1 and 2
P=a/3
Q+x=a/2
N= a-a/2-a/3= 1/6a(6-3-2)=1/6a
T=a
N/T= 1/6
What is the OA?