Question 1074551
{{{r+c=45/3=15}}}
and
{{{r-c=45/4.5=10}}}



{{{r+c-(r-c)=5}}}

{{{2c=5}}}

{{{highlight(c=2&1/2)}}}, 



{{{r+c+r-c=25}}}

{{{2r=25}}}

{{{r=25/2}}}

{{{highlight(highlight(r=12&1/2))}}}