Wina
Benar+salah=50 - 6=44 soal
[tex]5b - 2s = 171 \\ 5(44 - s) - 2s = 171 \\ 220 - 5s - 2s = 171 \\ 220 - 7s = 171 \\ 220 - 171 = 7s \\ 49 = 7s \\ \frac{49}{7} = s \\ s = 7 \: soal \: (d)[/tex]
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Wina
Benar+salah=50 - 6=44 soal
[tex]5b - 2s = 171 \\ 5(44 - s) - 2s = 171 \\ 220 - 5s - 2s = 171 \\ 220 - 7s = 171 \\ 220 - 171 = 7s \\ 49 = 7s \\ \frac{49}{7} = s \\ s = 7 \: soal \: (d)[/tex]