Question 1074694
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Noah is six years older then Danielle. In three years, <s>this some</s> THE SUM of their ages will be 42.  How old is Noah now?
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{{{system(n=d+6,(n+3)+(d+3)=42)}}}



{{{n+d=36}}}

{{{(d+6)+d=36}}}

.
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ALTERNATIVE
{{{n=d+6}}}
{{{d=n-6}}}
-
{{{n+d=36}}}
{{{n+(d-6)=36}}}
{{{2n=36+6}}}
{{{n=21}}}-----Noah now