In a certain city, only two newspapers 
and 
are published. It is known that 
of the city population read 
and 
read 
, while 
read both. It is also known that 
of those who read 
but not 
, look into advertisements and 
of those who read 
not 
, look into advertisements while 
of those who reads both 
and 
look into the advertisements. If 
of the population read an advertisements. Then, the value of 
is 
Text Solution
Verified by Experts13.9
(13.9)
Let 
Set of people who read newspaper 
and 
Set of people who read newspaper 
Given, 
and 
But total number of people who read 
but not 
of people reading newspaper 
but not 
of 17
and 
Also, total number of people who read newspaper 
but not 
of people reading newspaper 
but not 
of 12
and given total people who read newspaper 
and 
of people who read newspaper 
and 
of 8
∴ Percentage of people reading an advertisement
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