Question
20% of the people are performers for a concert and the rest are spectators. 80% of the spectators are adults and there are 2400 more adults spectators than children spectators. How many adult spectators must join so that 90% of the people in the concert are adult spectators?
5 m

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20% of the people are performers for a concert and the rest are spectators. 80% of the spectators are adults and there are 2400 more adults spectators than children spectators. How many adult spectators must join so that 90% of the people in the concert are adult spectators?