matematika = M, biologi = B
2 M + 3 B = 300, maka ada 3 kemungkinan
1. nilai M = 70 (syarat 1)
maka
2 M + 3 B = 300
2 x 70 + 3B = 300
140 + 3B = 300
3 B = 300-140= 160
B = 160/3 = 53,3
M + B = 70+53,3 = 123,3 (ditolak krn kurang dr 130)
2. jika B = 50 (syarat 2)
2 M + 3x50 = 300
2 M + 150 = 300
2 M = 300-150=150
M = 75
M + B = 75 + 50 = 125 (kurang dr 130, ditolak)
3. jumlah M + B = 130 (syarat 3)
M = 130-B
2M + 3B = 300
2(130-B) + 3 B = 300
260 - 2B + 3 B = 300
B = 300-260=40 (kurang dr 50, ditolak)
jadi peserta tsb pasti ditolak (A)
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matematika = M, biologi = B
2 M + 3 B = 300, maka ada 3 kemungkinan
1. nilai M = 70 (syarat 1)
maka
2 M + 3 B = 300
2 x 70 + 3B = 300
140 + 3B = 300
3 B = 300-140= 160
B = 160/3 = 53,3
M + B = 70+53,3 = 123,3 (ditolak krn kurang dr 130)
2. jika B = 50 (syarat 2)
2 M + 3x50 = 300
2 M + 150 = 300
2 M = 300-150=150
M = 75
M + B = 75 + 50 = 125 (kurang dr 130, ditolak)
3. jumlah M + B = 130 (syarat 3)
M = 130-B
2M + 3B = 300
2(130-B) + 3 B = 300
260 - 2B + 3 B = 300
B = 300-260=40 (kurang dr 50, ditolak)
jadi peserta tsb pasti ditolak (A)