Question 151276
{{{r/b = 3/1}}}
{{{r=3b}}}
{{{(r+3)/(b+4) = 2/1}}}
{{{(3b+3)/(b+4) = 2/1}}}
{{{3b+3 = 2(b+4)}}}
{{{3b+3 = 2b + 8}}}
{{{b = 5}}}
So r = 15