The sum of the present ages of A, B, C is 39 years. Three years ago their ages were in the ratio 1:2:3. What is the present age of A?  Options.
A) 5
B) 6
C) 7
D) 8
E) 9
Three years ago:   a:b:c = 1:2:3   Let a = 1x, b = 2x, and c = 3x.   Today:   (x+3) + (2x+3) + (3x+3) = 39   x = 5   So the present age of A is x+3 = 8   The answer is 8.
<result>D</result>
The sum of the present ages of A, B, C is 39 years. Three years ago their ages were in the ratio 1:2:3. What is the present age of A?