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.
+36916 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
