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Math Problem: When a movie ticket goes to 20 yuan, the audience will double and the income will increase by one fifth. How much will a movie ticket be reduced?
Suppose the original overall income was 1, and now the income is 1+ 1/5=6/5, because the audience has doubled.
So the reduced fare is 6/5/2=3/5, so the current fare is 20*(3/5)= 12 yuan.
Therefore, the price of movie tickets is reduced by 20- 12=8 yuan.