Question
In a parade square, 710 of the pupils wore ties. After 20 pupils who wore ties left the parade square, the percentage of pupils who wore ties decreased to 60%. How many pupils in the parade square did not wear ties?
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In a parade square, 710 of the pupils wore ties. After 20 pupils who wore ties left the parade square, the percentage of pupils who wore ties decreased to 60%. How many pupils in the parade square did not wear ties?