Question 1208110
<pre>
A          B         C       D       E
-----------|---------|-------|-------|----


          |__________16______|


|______________________34____________|
</pre>

If x=AB=BC=CD then

{{{2x=16}}}

{{{x=8}}}.


From that, 
{{{3x+DE=34}}}
{{{DE=34-3x}}}
{{{DE=34-24}}}
{{{DE=10}}}


Question asked for CE.

{{{CE=CD+DE}}}

{{{CE=x+10}}}

{{{CE=8+10}}}

{{{highlight(CE=18)}}}