Trong đợt quyên góp ủng hộ người nghèo ,lớp 9A và lớp 9B có 79 học sinh quyên góp được 975000 đồng. Mỗi học sinh lớp 9A đóng góp 10000 đồng ,mỗi học sinh lớp 9B đóng góp 15000 đồng. Tính số học sinh mỗi lớp Mọi người giúp em với ạ!!

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