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Calculati:76t:2=?t=?q=?kg;18000t:900=?t=?kg;504000q:18=?q=?kg;72000kg:16=?q;8*6500kg=?kg=?q=?t;95000t*6=?t=?q;4200g*600=?g=?kg=?hg;407q*90=?q=?t.