Question 1207019
<pre>
(a/b)=(c/d)= k , b,d ≠ 0 , prove that (a+c)/(b+d) = k

{{{a/b=c/d}}}

{{{a/c=b/d}}}

{{{a/c+c/c=b/d+d/d}}}

{{{(a+c)/c=(b+d)/d}}}

{{{(a+c)/(b+d)=c/d=k}}}

Edwin</pre>