Năm 2020, để ủng hộ đồng bào miền Trung bị thiệt hại do lũ lụt, mỗi học sinh lớp 10A đóng góp 20.000 đồng, mỗi học sinh lớp 10B góp 25.000 đồng. Cả hai lớp ủng hộ được 1.155.000 đồng. Tháng 5 năm 2021, lớp 10A góp 50.000 đồng/ học sinh và lớp 10B góp mỗi bạn 30.000 đồng; thu được 2.010.000 đồng để ủng hộ Quỹ Vacxin phòng Covid-19 của Chính phủ. Gọi số học sinh của hai lớp lần lượt là x và y. Tính |x – y|.

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