(a/b)(b/c)(c/d)(d/e)(e/f)(c/d)(d/e)(b/c)(c/d) = (abc)/(def) = 147/320.
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?
If a/b = 51/54; c/d = 440/493; b/c = 29/32; e/f = 493/608; and d/e = 38/55 then what is the value of (abc/def)*17 = ?