The math teacher is announcing the mid-term exam results,"The number of students who got above ninety is the same as above eighty. The number of students who got eighties is the same as got seventies."
The whole class burst into cheers as soon as he finished his words. A student still worried:"What about the number of students who failed"
The teacher slowly continued,"The number of students who failed is the same as the number of students in the class."
數(shù)學老師在宣布期中考試的成績:"90 分以上和 80 分以上的人數(shù)一樣多,80分以上和70分以上的人數(shù)也一樣多。"
他的話剛說完,全班一陣歡呼。 一位同學不放心地追問:"那么不及格的人數(shù)呢?"
老師不緊不慢地回答:"不及格的人數(shù)和全班的人數(shù)一樣多。"