If a/b = 9/14, c/d = 49/51, b/c = 17/18, e/f = 34/35 and d/e = 27/28 then what is the value of abc/def?

Question

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?

Answer 1

(a/b)(b/c)(c/d)(d/e)(e/f)(c/d)(d/e)(b/c)(c/d) = (abc)/(def) = 147/320.