Question
In a school field, 310 of the pupils wore ties. After 600 pupils who wore ties entered the school field, the percentage of pupils who wore ties increased to 90%. How many pupils in the school field did not wear ties?
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In a school field, 310 of the pupils wore ties. After 600 pupils who wore ties entered the school field, the percentage of pupils who wore ties increased to 90%. How many pupils in the school field did not wear ties?