Question 636507
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Hi,
Billy is twice as old as his son's age{{{highlight(x)}}} ( Billy's age now being 2x)
in 10 years, the ratio of their ages will be 3:5
Question states***
 {{{ (x+10)/(2x + 10) = 3/5}}}  Cross Multiplying to solve for x
   5(x+10) = 3(2x+10)
   5x + 50 = 6x + 30
        20 = x, son' age NOW, Billy is NOW 40
and...in 10 years
   {{{30/50 = 3/5}}}