The ratio of present ages of X and Y is 4:5. Which of the following cant be the ratio of ages of X and Y, 20 years ago? Choices: A) 2:4 B) 9:10 C) 2:3 D) 3:5 E) 3:6
9:10   as ratio of X:Y can not be more than 4:5 earlier.   ANSWER:9:10
<result>B</result>
The ratio of present ages of X and Y is 4:5. Which of the following cant be the ratio of ages of X and Y, 20 years ago?