最多20人,最少8人
翻譯:
一個有42人的班級中,30人喜歡體育,20人喜歡藝術(shù).至少有多少學(xué)生同時喜歡這2項.至多有多少學(xué)生同時喜歡這2項.
首先算至少:如果30人喜歡體育,20人喜歡藝術(shù),那么加起來就一共有50人了,可班上明明只有42人,這多出來的8人就是兩項都喜歡的,因為他們在喜歡體育時被算了一次,喜歡藝術(shù)時又被算了一次,所以總?cè)藬?shù)超過了42.
再算至多:因為30人大于20人,所以喜歡藝術(shù)的可以全部喜歡體育但是喜歡體育的沒辦法全部喜歡藝術(shù),否則會多出10個人.因此最多20人
Of 42 students in a class,30 of them like PE,20 like Art.
Of 42 students in a class,30 of them like PE,20 like Art.
How many of them like the both subjects at least?How many of them like the both subjects at most?
How many of them like the both subjects at least?How many of them like the both subjects at most?
數(shù)學(xué)人氣:203 ℃時間:2019-10-11 19:02:23
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