If a: b = 1:4, b:c = 13:9, c:d = 5:13, find a:d? Choose the correct choice from the following choices:	A) 5 / 46	B) 7 / 36	C) 1 / 36	D) 5 / 36	E) 5 / 37

Rationale: a / d = ( 1 / 4 ) * ( 13 / 9 ) * ( 5 / 13 ) = > 5 / 36 answer : d
Answer: D