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In a survey of a group of people, it was found that 70% of the people liked folk songs, 60% liked modern songs, 4000 people liked both of them and 10 % liked none of them.  Find the total number of people in the survey.

 Mar 12, 2020
 #1
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100% is the number of people in the survey

-10% = 90%

 

70% - 4000    +    60% - 4000    + 4000 = 90

130% - 4000 = 90%

-4000 = -40%

100% = 10 000 people

 Mar 12, 2020

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