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let's say "S" denotes no of statues and "P" denotes no of paintings. Given that, S/P = 3/10 => P/S = 10/3 (making it reverse) ----(1) Also, S/(P-30) = 12/25 => (P-30)/S = 25/12 (making it reverse).....(2) Eq (2) can be rewritten as: P/S - 30/S = 25/12 => 10/3 - 30/S = 25/12 (from...