Nilai ulangan matematika 5 siswa adalah 80. Jika ditambah nilai Ani rata-ratanya menjadi 78. Nilai Ani adalah ....
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nilai ani = x
400 + x (jmlh nilai siswa ditambah ani)
= 400 + x : 6 (rata" nilai 78)
= 78
= 6 x 78
= 468
= 68
nilai ani = 68