Question 1168152
Say it correctly!


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In three years, Sheena will be three times as old as her sister Melona. A year ago, Sheena was seven times as old as Melona. 
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First sentence
{{{s+3=3(m+3)}}}
{{{s-3m=6}}}


Second sentence
{{{s-1=7(m-1)}}}
{{{s-7m=-6}}}
{{{-s+7m=6}}}


System to use if you prefer
{{{system(s-3m=6,-s+7m=6)}}}


ADD corresponding members.
{{{4m=12}}}
{{{highlight(m=3)}}}---------Melona now


Sheena?
{{{s-3m=6}}}
{{{s=3m+6}}}
{{{s=3*3+6}}}
{{{highlight(s=15)}}}-------Sheena