please help me!

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/16 10:09:07

please help me!
锅炉房现存的煤,估计这一段时期内每天用5.5吨煤,则可以剩下90吨,每天用6吨,则可剩下30吨,存煤多少吨?

6-5.5=0.5
（90-30）/0.5=120天
5.5X120+90=750吨
6X120+30=750吨
所以存煤750吨

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