If A:B=4:7 AND B:C=5:9,THEN A:C=?	Choose the correct choice from the following options.
A) 28 : 37	B) 18 : 37	C) 16 : 53	D) 20 : 63	E) 15 : 48

Rationale: a / b = 4 / 7 and b / c = 5 / 9 a / b * b / c = 4 / 7 * 5 / 9 = 20 / 63 so a / c = 20 / 63 20 : 63 answer d
Answer: D