[tex] A = sekolah \: A \\ B = A - 50 \\ C = B - 30 \\ C = A - 50 - 30 \\ C = A - 80 \\ \\ A + B + C = 650 \\ A + A - 50 + A - 80 = 650 \\ 3A - 130 = 650 \\ 3A = 650 + 130 \\ 3A = 780 \\ A = \frac{780}{3} \\ A = 260 \: (C)[/tex]
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[tex] A = sekolah \: A \\ B = A - 50 \\ C = B - 30 \\ C = A - 50 - 30 \\ C = A - 80 \\ \\ A + B + C = 650 \\ A + A - 50 + A - 80 = 650 \\ 3A - 130 = 650 \\ 3A = 650 + 130 \\ 3A = 780 \\ A = \frac{780}{3} \\ A = 260 \: (C)[/tex]