Sandy is younger than Molly by 18 years. If the ratio of their ages is 7:9, how old is Sandy? Answers.
A) 42	B) 49	C) 56	D) 63	E) 70

Rationale: "let sandy ' s age be 7 x and let molly ' s age be 9 x . 9 x - 7 x = 18 x = 9 sandy is 63 years old . the answer is d ."
Answer: D