a²−b²=2640 ___________________(i) a²+b²=6338___________________(ii) (i)+(ii) → 2a² = 8978 => a = 67 (i)+(ii) → 2b² = 3698 => b = 43
66263
67*43*23
If a/b = 21/34; b/c = 121/120; c/d = 17/77; e/f = 11/15 and d/e = 14/17 then what is the value of (abc/def)*2?