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10 = [(p - 3) + (q + 2) + (r + 7)]/3
30 = (p + q + r - 6)
p + q + r = 36
rataan baru = [(p + 3) + (q + 11) + (r - 2)]/3
= [(p + q + r) + (3 + 11 - 2)]/3
= [36 + 12]/3
= 16