Today Mary’s father is four times as old as Mary. Eight years ago, he was 12 times as old. How old is Mary today? Choices: A) 6 B) 7 C) 10 D) 11 E) 15
11ad's age = 4M   12*(M-8) = 4M-8   8M = 88   M = 11   The answer is 11.
<result>D</result>
Today Mary’s father is four times as old as Mary. Eight years ago, he was 12 times as old. How old is Mary today?