Today Mary’s father is four times as old as Mary. Seven years ago, he was 7 times as old. How old is Mary today? Choose the most appropriate option: A) 11 B) 12 C) 13 D) 14 E) 15
14ad's age = 4M   7*(M-7) = 4M-7   3M = 42   M = 14   The answer is 14.
<result>D</result>
Today Mary’s father is four times as old as Mary. Seven years ago, he was 7 times as old. How old is Mary today?