<PRE><B>Question 4991</B>
let the numbers be x and y
&lt;P&gt;
x+y=30
x-y=40
&lt;P&gt;
adding the two eqns we get
2x=70
x=35
&lt;P&gt;
y=30-x
y=30-35
y=-5
&lt;P&gt;
Hence the numbers are: &lt;B&gt;35,-5&lt;/b&gt;</PRE>