Question 1135247
<pre>
PERSON           AGE
man              4x
son              2x
daughter          x
Sum              77
</pre>

{{{4x+2x+x=77}}}
-
{{{7x=77}}}
{{{x=11}}}
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<pre>
PERSON           AGE
man              44
son              22
daughter         11 
Sum              77
</pre>