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Skor Benar = 3
Skor Salah = 1
Tidak Dijawab = 0
Dijawab = 31
Nilai = 81
Jawab:
Dijawab Benar = 28
3 x 28 = 84
Dijawab Salah = 3
1 x 3 = 3
Nilai Dedi = 84 - 3
Nilai Dedi = 81
Jadi Dijawab Benar oleh Dedi 28
-------------------------------------
[CARANYA]
Dijawab Benar = x
Dijawab Salah = y
[ELIMINASI]
3x - y = 81
x + y = 31
------------------- +
4x = 112
x = 28 (SKOR BENAR)
[SUBTITUSI]
x + y = 31
28 + y = 31
y = 31 - 28
y = 3 (SKOR SALAH)