June 14, 2021 10:55 am
Topic starter
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A survey of n people found that 60 percent preferred brand A. An additional x people were surveyed who all preferred brand A. Seventy percent of all the people surveyed preferred brand A. Find x in terms of n.
A) B)
C)
D) n E) 3n
1 Answer
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June 14, 2021 10:55 am
Topic starter
The total number of people surveyed was Since 70 percent of the total preferred brand A, that means
preferred brand A. However, 60 percent of the
people and all of the
people preferred brand A. So,
preferred brand A. Therefore,
must equal
So we have