If a : b = 5 : 9 and b : c = 4: 7, find a : b : c  Choose the correct choice from the following options
A) 63:36:20	B) 36:20:63	C) 20:63:36	D) 20:36:63	E) None of them
a:b=5:9 and b:c=4:7= (4X9/4): (7x9/4) = 9:63/4   a:b:c = 5:9:63/4 =20:36:63.   Answer is 20:36:63.
<result>D</result>
If a : b = 5 : 9 and b : c = 4: 7, find a : b : c