<PRE><B>Question 601331</B>
&lt;br&gt;&lt;font face=&quot;Tahoma&quot;&gt;Let F be the father&#39;s current age.&lt;br&gt;

Let S be the son&#39;s current age.&lt;br&gt;

{{{F=3*S}}}  and  {{{(F+10)=2*(S+10)}}}&lt;br&gt;

Since we have F by itself, substitute this value for F into the second equation:&lt;br&gt;

{{{(F+10)=2*(S+10)}}}&lt;br&gt;

{{{(3*S+10)=2*(S+10)}}}&lt;br&gt;

{{{3*S+10=2*S+20)}}}&lt;br&gt;

{{{S=10)}}}&lt;br&gt;

If S=10, then we know&lt;br&gt;

{{{F=3*S}}}&lt;br&gt;

{{{F=3*10}}}&lt;br&gt;

{{{F=30}}}&lt;br&gt;

Thus, the father is currently 30 years old, and his son is 10 years old.&lt;br&gt;

I hope this helps!  :)&lt;br&gt;

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