Question 1170973
r, peteR
L, pauL

{{{system(r+L=24,(r-5)/(L-5)=3/4)}}}

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{{{L=24-r}}}
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{{{(r-5)/(24-r-5)=3/4}}}
{{{(r-5)/(19-r)=3/4}}}
{{{4r-20=3*19-3r}}}
{{{7r=77}}}
{{{r=11}}}
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{{{L=13}}}
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In three more years:
{{{system(highlight(r=14),highlight(L=16))}}}