The ratio between the present ages of A and B is 6:3 respectively. The ratio between A's age 4 years ago and B's age 4 years hence is 1:1. What is the ratio between A's age 4 years hence and B's age 4 years ago?  Choose the most appropriate option.
A) 5:4
B) 3:0
C) 5:1
D) 3:2
E) 3:7
Let the present ages of A and B be 6x and 3x years respectively.   Then, (6x - 4)/(3x + 4) = 1/1   3x = 8 =&gt; x = 2.67   Required ratio = (5x + 4):(3x - 4) = 20:4 =5:1.Answer: 5:1
<result>C</result>
The ratio between the present ages of A and B is 6:3 respectively. The ratio between A's age 4 years ago and B's age 4 years hence is 1:1. What is the ratio between A's age 4 years hence and B's age 4 years ago?