Sandy is younger than Molly by 10 years. If their ages are in the respective ratio of 7:9, how old is Molly? Choices:
A) 27
B) 36
C) 45
D) 54
E) 63
S = M - 10   S / M = 7/9   9S = 7M   9(M-10) = 7M   M = 45   The answer is 45.
<result>C</result>
Sandy is younger than Molly by 10 years. If their ages are in the respective ratio of 7:9, how old is Molly?