設獲得$300禮劵的同事人數為x人。
300x+400(180-x)=57000
300+72000-400x=57000
-100x=-15000
x=150
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設獲得$300禮劵的同事人數為x人。
300x+400(180-x)=57000
300+72000-400x=57000
-100x=-15000
x=150
Users viewing this question
are also looking at these questions 😉
