If 49a^2 + 30ab + 25b^2 - 100ab = 289 then what is the value of (2187)^a / (243)^b = ?
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?