Question
The number of boys in the school hall was 37 that of the girls. There were 276 more girls than boys. After some girls had left the school hall, the number of boys at the school hall was thrice the number of the remaining girls. How many girls left the school hall?
4 m

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The number of boys in the school hall was 37 that of the girls. There were 276 more girls than boys. After some girls had left the school hall, the number of boys at the school hall was thrice the number of the remaining girls. How many girls left the school hall?