SOLUTION: Billy is twice as old as his son. In 10 years, the ratio of their ages will be 3:5. Find their present ages.

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Question 339804: Billy is twice as old as his son. In 10 years, the ratio of their ages will be 3:5. Find their present ages.
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
let Son be x years
Billy = 2x
after 10 years
...
son x+10
Billy = 2x +10
..
+%28x%2B10%29%2F%282x%2B10%29=3%2F5
5(x+10)=3(2x+10)
5x+50==6x+30
6x-5x=50-30
x= 20 years son's age
Bill = 2x = 2*20 = 40 years