GMAT 考满分题库

Magoosh - 数学PS - 220
In a certain school, there are 160 boys and 240 girls. If 15 percent of the boys are left-handed and 25 percent of the girls are left-handed, what percent of the school`s entire student population is left-handed?
  • A18
  • B20
  • C21
  • D23
  • E24
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正确答案: C

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