There are 210 students in the level and they are divided into groups of three. It is found that:
  1. There are 23 groups with only 1 boy.
  2. There are 34 groups with two or more boys.
  3. The number of all-boy groups is twice the number of all-girl groups.
How many girls are there in the level? Ans: ___

Mixed operations with integersLetters represent numbers中文
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