<PRE><B>Question 537016</B>
The answer is obvious just by inspection.  3+2=5 and 4+2=6.&lt;P&gt;
By algebra.&lt;P&gt;
{{{(3+n)/(4+n)=5/6}}}&lt;P&gt;
Cross multiply&lt;P&gt;
{{{6(3+n) = 5(4+n)}}}&lt;P&gt;
Multiply each number by what&#39;s inside the ()&lt;P&gt;
{{{18 + 6n = 20 + 5n}}}&lt;P&gt;
Subtract 5n from both sides, subtract 18 from both sides.&lt;P&gt;
n = 2

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