Question
In a school field, 47 of the boys wore cardigans. After 207 boys who wore cardigans entered the school field, the percentage of boys who wore cardigans increased to 90%. How many boys in the school field did not wear cardigans?
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In a school field, 47 of the boys wore cardigans. After 207 boys who wore cardigans entered the school field, the percentage of boys who wore cardigans increased to 90%. How many boys in the school field did not wear cardigans?