Sandy is younger than Molly by 12 years. If their ages are in the respective ratio of 7:9, how old is Molly?  Choose the correct answer.
A) 36	B) 45	C) 54	D) 63	E) 72
S = M - 12   S / M = 7/9   9S = 7M   9(M-12) = 7M   M = 54   The answer is 54.
<result>C</result>
Sandy is younger than Molly by 12 years. If their ages are in the respective ratio of 7:9, how old is Molly?