Suppose a/b=3/5, b/c=6/15, and c/d=6. What is the value of a/d?
a/b = 3/5
b /c = 6/15
c / d = 6/1
(a/ b) ( b / c) = (a/c) = ( 3/5) (6/15) = 18 / 75 = 6/25
(a/c) (c/d) = ( a/ d) = ( 6/25) (6/1) = 36 / 25
