Question 1163821
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 how old is Benny?
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<pre>
Annie          2b
Benny           b
Cindy           b/3
TOTAL           70
</pre>

{{{2b+b+b/3=70}}}
{{{3b+b/3=70}}}
{{{9b+b=210}}}
{{{10b=210}}}
{{{highlight(b=21)}}}